Module in General Mathematics Grade 11 Second Quarter, Week 3 To Week 4
Module in General Mathematics Grade 11 Second Quarter, Week 3 To Week 4
DEPARTMENT OF EDUCATION
                                     Region I
                      SCHOOLS DIVISION OFFICE I PANGASINAN
                        LABRADOR NATIONAL HIGH SCHOOL
                                Labrador,Pangasinan
Prepared by:
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Quarter 2 – Module 7
Annuities
                                 2
  Lesson
       1              Simple Annuity
           What I need to know…
What I know…
PRE-TEST
Direction: Choose the letter of the correct answer and write on the separate
sheet of paper.
__________3. The sum of future values of all the payments to be made during
      the entire term of annuity
            a.) Annuity
            b.) Present Value of an annuity
            c.) Future Value of an annuity
            d.) Periodic Payment
                                        3
__________4. The sum of all present values of all the payments to be made
      during the entire term of the annuity.
            a.) P12,806.63
            b.) P12,860.36
            c.) P12,860.63
            d.) P12,806.36
            a.) P15,024.31
            b.) P15,204.31
            c.) P15,402.31
            d.) P15,420.31
__________10. A teacher saves P5,000 every 6 months in the bank that pays
       0.25% compounded monthly. How much will be her savings after
            10 years?
            a.) P101,197.06
            b.) P101,179.06
            c.) P101,971.06
            d.) P101,791.06
__________11. It is an annuity that does not begin until a given time interval
      has passed.
__________13. Melvin availed of a loan from a bank that gave him an option to
             pay P20,000 monthly for 2 years . The first payment is due after 4
             months. How much is the present value of the loan if the interest
      rate is 10% converted monthly?
            e.) P422,795.78
            f.) P422,759.78
            g.) P422,579.78
            h.) P422,597.78
__________14. Annual payments of P2,500 for 24 years that will start 12 years
      from now. What is the period of deferral in the deferred annuity?
            e.) 12   periods
            f.) 10   periods
            g.) 11   periods
            h.) 13   periods
                                        5
__________15. Semi-annual payments of P6,000 for 13 years that will start 4
      years from now. What is the period of deferral in the deferred
      annuity?
                        What’s in…
                                      REVIEW
       You use money in everyday life. In order to buy what you need, you do
transactions involving money.
       In the previous lessons, you learned the methods of solving the value of
money under compound and simple interest environment. You have learned to
illustrate and distinguish between simple and compound. You also learned how
to compute for the interest, present value and future value in a simple and
compound interest environment. As well as solve problems involving real life
situations of simple and compound interest.
What’s new…
Ma’am Angel wants to start a business with an initial capital of P100,000. She
decided to put up a fund with deposits made at the end of each month. If she
wants to gain the initial capital after 4 years, how much monthly deposit must
be made?
 ANNUITY
ANNUITY
                                              6
      According to        Simple Annuity – an        General Annuity – an
    payment interval       annuity where the           annuity where the
   and interest period   payment interval is the   payment interval is not the
                          same as the interest        same as the interest
                                period                      period.
The time between the first payment interval and the last payment interval.
 The sum of future value of all the payments to be made during the entire
 term of the annuity.
 The sum of present value of all the payments to be made during the entire
 term of the annuity.
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    ILLUSTRATION
0 1 2 3 4 5 n
EXAMPLE 1:
  (1) Illustrate the cash flow in time diagram and Find the future value of
      all the payments at the end of term (t=6).
 Time         0          1           2           3         4       5       6 (in
months)
                                             8
Payment/ Deposit             3,000     3,000    3,000    3,000          3,000
3,000
3,000
3,000 (1 + 0.0075)
3,000 (1 + 0.0075) 2
3,000 (1 + 0.0075) 3
3,000 (1 + 0.0075) 4
3,000 (1 + 0.0075) 5
  (2) Add all the future values obtained from the cash flow.
        3,000                      = 3,000
        3,000 (1 + 0.0075)         = 3,022.50
        3,000 (1 + 0.0075) 2       = 3,045.17
        3,000 (1 + 0.0075) 3       = 3,068.01
        3,000 (1 + 0.0075) 4       = 3,091.02
        3,000 (1 + 0.0075) 5       = 3,114.20
Given:
                                      9
      F = 18, 340.89
Therefore, the amount of future value of Mrs. Manda’s savings after 6 months is
P18,340.89.
     EXAMPLE 2:
 To start a business, Jake wants to save a certain amount of money at the end
of every month to put in an account providing 2% interest compounded
monthly. His estimated start-up capital is P150,000. If he wants to start a
business in 1.5 years, how much monthly deposit must he put into the account?
SOLUTION:
Since the deposits are made at the end of every month, then this Is an example
of an ordinary annuity. Use FORMULA 1 with:
                                        10
         Thus, Jake must deposit P8,215.90 at the end of each month.
EXAMPLE 3:
Given:
    Periodic payment (R) = P3,000
    Term (t) = 6 months
    Interest rate per annum (annually) (i) = 0.09/9%
    Number of conversion per year (m) = 12
                                     11
  (1) Illustrate the cash flow in time diagram and Find the Present value
      of all the payments at the end of term (t=6).
 Time       0            1           2           3       4    5      6 (in
months)
3,000 (1 + 0.0075) -1
3,000 (1 + 0.0075) -2
3,000 (1 + 0.0075) -3
3,000 (1 + 0.0075) -4
3,000 (1 + 0.0075) -5
3,000 (1 + 0.0075) -6
  (2) Add all the present values obtained from the cash flow.
        3,000 (1 + 0.0075) -1      = 2,977.667
        3,000 (1 + 0.0075) -2      = 2,955.501
        3,000 (1 + 0.0075) -3      = 2,933.50
        3,000 (1 + 0.0075) -4      = 2,911.663
        3,000 (1 + 0.0075) -5      = 2,889.988
        3,000 (1 + 0.0075) -6      = 2,868.474
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    FORMULA 2: PRESENT VALUE
        b. The present value P of an ordinary annuity with regular
           payments R at a nominal interest rate I compounded m times
           a year after t years is
                                 𝑖 −𝑚𝑡
                       1−( 1+ 𝑚 )                                1−(1+ 𝑗 )−𝑛
              𝑃 = 𝑅[         𝑖           ]              𝑃 = 𝑅[        𝑗
                                                                               ]
                             𝑚
                 𝑖
     Note: j =
               𝑚
n = mt
Given:
    P = 17,536.79
Therefore, the amount of Present value of Mrs. Manda’s savings after 6 months is
P17,536.79.
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     EXAMPLE 4:
         A certain fund currently has P100,000 and is invested at 3% interest
compounded annually. How much withdrawal can be made at the end of each
year so that the fund will have zero balance at the end of 12 years?
SOLUTION:
Since withdrawals are made every end of the year, then this ordinary annuity.
Given:
    Periodic payment (R) = P100,000
    Term (t) = 12 years
    Interest rate per annum (annually) (i) = 0.03/3%
    Number of conversion per year (m) = 1
          10,046.21 = R
Hence, the amount of yearly withdrawal is P10,046.21.
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                   What is it…
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What’s more..
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   2. Find the present value of an ordinary annuity with regular quarterly
      opayments worth P1,000 at 3% annual interest rate compounded
      quarterly at the end of 4 years.
Complete the sentence below. Write your answers on a separate sheet of paper.
Solve for the following problems. Answer as indicated. Write your answers in a
separate sheet of paper.
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1. Mr. Ribaya paid P200,000 as downpayment for a car. The remaining
   amount is to be settled by paying P16,200 at the end of each month for 5
   years. If interest is 10.5% compounded monthly, what is the cash price of
   his car?
2. In order to save for her high school graduation, Marie decided to save
   P200 at the end of each month. If the bank pays 0.250% compounded
   monthly, how much will her money be at the end of 6 years?
Additional Activities…
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Answer as indicated. Write your answers in a separate sheet of paper.
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  Lesson
       2             General Annuity
           What I need to know…
What’s in…
REVIEW
What’s new…
 GENERAL ANNUITY
  A general annuity in which the periodic payment is made at the end of the
  payment interval.
                                      20
Examples of General annuity:
EXAMPLE 1:
                                     21
                                   Cash Flow
                                                                   F
              1,000   1,000   1,000 . . . . . . . . . . . 1,000   1,000
0 1 2 3 . . . . . . . . . . . . . 179 180
(2) Apply the formula in finding the future value of an ordinary annuity using
the computed equivalent rate.
                                          22
     EXAMPLE 2:
SOLUTION
The Cash Flow for this problem is shown in the diagram below.
(1) Convert 8% compounded quarterly to its equivalent interest rate for each
payment interval
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   (2) Apply the formula in finding the present value of an ordinary annuity
      using the computed equivalent rate j = 0.082432.
EXAMPLE 3:
           Mr. Ribaya received two offers on a lot that he wants to sell. Mr.
Ocampo has offered P50,000 and a P1million lump sum payment 5 years from
now. Mr. Cruz has offered P50,000 plus P40,000 every quarter for five years.
Compare the fair market value of the two offers if money can earn 5%
compounded annually. Which offer has a higher market value?
                                      24
  P50,000 down payment P1,000,000                P50,000 down payment P40,000
            after 5 years                           every quarter for 5 years
SOLUTION:
We illustrate the cash flows of the two offer using time diagram
50,000 1 million
0 1 2 3 4 5
0 1 2 3 . . . . . . . . . . . . . . . . 20
      Choose a focal date and determine the values of the two offers at that focal date.
For example the focal date can be the date at the start of the term.
      Since the focal date is at t = 0, compute for the present value of each offer.
        Mr. Ocampo’s Offer: Since P50,000 is offered today, then its present value is
still P50,000. The present value of P1,000,000 offred 5 years from now is
      P = F (1 + j)-n
      P = 1,000,000 (1 + 0.05)-5
P = P783, 526.20
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                          FMV = P833,526.20
      Mr. Cruz’s Offer: We first compute for the present value of a general annuity
with quarterly payments but with annual compounding period at 5%.
      Solve the equivalent rate, compounded quarterly of 5% compounded annually.
       Hence, Mr. ocampo’s Offer has a higher market value. The difference
between the market values of the two offers at the start of the term is
          833,526.20 – 756,572.70 = P77,953.50
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             What is it…
  ___________________________________________________________________________
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  3. Express the process in finding the Present and future value of General
     ordinary annuity.
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    ________________________________________________________________________
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What’s more..
                 COMPANY A                            COMPANY B
        P150,000 at the end of 3 years         P25,000 at the end of each
        P300,000 at the end of 5 years             quarter for 5 years
Complete the sentence below. Write your answers on a separate sheet of paper.
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   4. _____________________________________ of a cash flow on a particular date
      refers to a single amount that is equivalent to the value of the payment
      stream at that date.
Solve for the following problems. Answer as indicated. Write your answers in a
separate sheet of paper.
   1. Mrs. Remoto would like to buy a television (TV) set payable for 6 months
      starting at the end of the month. How much is the cost of the TV set if
      her monthly payment is P3,000 and interest is 9% compounded
      semiannually?
   2. Kat received two offers for investments. The first one is P150,000 every
      year for 5 years at 9% compounded annually. The other investment
      scheme is P12,000 per month for 5 years with the same interest rate.
      Which fair market value between these offers is preferable?
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  Lesson
       3            Deferred Annuity
                      What I need to know…
What’s in…
REVIEW
      In the previous lessons, you learned the methods of solving the value of
money under General annuities. You were able to find the future and present
value of general annuities and compute the periodic payment of a general
annuity. And you also solve for the fair market value of a cash flow stream that
includes an annuity. As well as solve problems involving real life situations of
General annuities.
What’s new…
 In this section, you will explore annuities whose payments do not necessarily
start at the beginning or at the end of the next compounding period. For instance,
for certain employee who will retire in 20 years, his pension will only start after
20 years.
 DEFERRED ANNUITY
 PERIOD OF DEFERRAL
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  The time between the purchase of an annuity and the start of the payments
  for the deferred annuity.
ILLUSTRATION
R* R . . . . . . . . . . . . . . . R* R R. . . R
        In the time diagram the period of deferral is k because the regular payments of
R start at the time k+1.
        The rotation R* represent k”artificial payments”, each equal to R but are not
actually paid during the period of deferral.
                                                   31
      EXAMPLE 1:
  Time        0   1   2   . . . . . .. . .        12 13 14 15 16 . . . .   35 36
(in months)
                                             32
                                                      Payment Period
Time        0   1   2     . . . . . .. . .     12 13 14 15 16 . . . .   35 36
(in months)
P116,930.64
P114,046.58
       Notice that there are two stages in finding the present value of a deferred
annuity: (1) find the value of the payment at the start of the payment period by
using the formula for the present value of an annuity, and then (2) fin the value
of the amount to be obtained at the start (or time 0) by using the formula for
the present value of a single amount given in the formula of the resent value of
a deferred annuity.
If the period is k-years, you call the annuity a k-year deferred annuity
What is it…
   ___________________________________________________________________________
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   ___________________________________________________________________________
   ___________________________________________________________________________
   ___________________________________________________________________________
What’s more..
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                    What have I have learned..
Complete the sentence below. Write your answers on a separate sheet of paper.
Solve for the following problems. Answer as indicated. Write your answers in a
separate sheet of paper.
                                       35
   4. Melvin availed of a loan from a bank that gave him an option to pay
            P20,000 monthly for 2 years . The first payment is due after 4
            months. How much is the present value of the loan if the interest
            rate is 10% converted monthly?
   5. Quarterly payments of 300 for 9 years that will start 1 year from now,
      What is the period of deferral in the deferred annuity?
Assessment…
POST-TEST
Direction: Choose the letter of the correct answer and write on the separate
sheet of paper.
                                       36
            a.) Future Value of an annuity
            b.) Present Value of an annuity
            c.) Annuity
            d.) Periodic Payment
__________3. The sum of future values of all the payments to be made during
      the entire term of annuity
            a.) Annuity
            b.) Present Value of an annuity
            c.) Future Value of an annuity
            d.) Periodic Payment
__________4. The sum of all present values of all the payments to be made
      during the entire term of the annuity.
            a.) P12,806.63
            b.) P12,860.36
            c.) P12,860.63
            d.) P12,806.36
            a.) P15,024.31
            b.) P15,204.31
            c.) P15,402.31
            d.) P15,420.31
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            b.) General Ordinary Annuity
            c.) Cash Flow
            d.) Annuity Certain
__________10. A teacher saves P5,000 every 6 months in the bank that pays
0.25% compounded monthly. How much will be her savings after 10 ears?
            a.) P101,197.06
            b.) P101,179.06
            c.) P101,971.06
            d.) P101,791.06
__________11. It is an annuity that does not begin until a given time interval
      has passed.
                                        38
__________13. Melvin availed of a loan from a bank that gave him an option to
             pay P20,000 monthly for 2 years . The first payment is due after 4
             months. How much is the present value of the loan if the interest
      rate is 10% converted monthly?
            a.) P422,795.78
            b.) P422,759.78
            c.) P422,579.78
            d.) P422,597.78
__________14. Annual payments of P2,500 for 24 years that will start 12 years
      from now. What is the period of deferral in the deferred annuity?
            a.) 12   periods
            b.) 10   periods
            c.) 11   periods
            d.) 13   periods
References:
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