ANNUITYby: LLOYD PSYCHE T. BALTAZAR
LESSON OBJECTIVESAt the end of the lesson, you are expected to:a. distinguishes between simple and general annuities;b. finds the future value and present value of both simple annuities andgeneral annuities; andc. calculates the present value and period of deferral of a deferred annuity.
DEFINITION OF TERMSANNUITY- a series of equal payments made at equal intervals of timePAYMENT INTERVAL- the period of time between successivepayments (e.g. monthly, quarterly)FUTURE VALUE- sum of future values of all the payments tobe made during the entire term of theannuity.TERM OF ANNUITY- the length of time between the beginningof the first payment period and the end ofthe last payment period.PRESENT VALUE- sum of present values of all the paymentsto be made during the entire term of theannuity
DEFINITION OF TERMSORDINARY ANNUITY- a series of payments where each periodic paymentis made at the end of the payment interval.SIMPLE ANNUITYGENERAL ANNUITY- is an annuity whose interest conversionperiod is equal to the payment interval.- is an annuity whose interest conversionperiod is not equal to the payment interval.Example:Monthly payments, and the interestis compounded monthlyExample:Monthly payments, but the interestis compounded semi-annually
Formula for Simple Ordinary AnnuityFV R(1 π)π 1π1 (1 π) ππPV Rwhere:FV future value of simple ordinary annuityPV present value of simple ordinary annuityR amount of periodic paymenti rate of interest per conversion periodπππ‘π ππ οΏ½οΏ½ππ πππ ππππππn number of payment (πππ. ππππππ π‘πππ ππ ππππ’ππ‘π¦)
ILLUSTRATIVE PROBLEMREGULAR/PERIODICPAYMENT (R)A person made a deposit of 2,000 at the end of each six monthsfor 2 years at 5% compounded semi-annually. How much is in hisaccount at the end of 2 years?RATE OF INTERESTCONVERSION PERIODTERM OF ANNUITYPAYMENT INTERVAL
Prob 1: A person made a deposit of 2,000 at the end of each sixmonths for 2 years at 5% compounded semi-annually. How much is inhis account at the end of 2 years?Given:To find i,π 2,000π 0.05term of annuity 2π πππ‘π ππ οΏ½οΏ½ππ πππ πππππππ 0.052To find n,π πππ. ππππππ π‘πππ ππ ππππ’ππ‘π¦πΉπ π (1 π)π 1ππΉπ π (1 π)π 1ππΉπ 2,000(1 0.025)4 10.025πΉπ 2,000(1.025)4 10.025π 0.025con. period 2payment int. 2Solution for FV:π 2 2π 4πΉπ 8,305.03
Prob 2: A television (TV) set is for sale at 13,499 in cash or oninstallment terms, 2,500 each month for the next 6 months at 9%compounded monthly. If you were the buyer, what would you prefer,cash or installment?Given:To find i,π 2,500π 0.09term of annuity 61ππ122π πππ‘π ππ οΏ½οΏ½ππ πππ πππππππ 0.0912ππ π 1 (1 π) ππππ π 1 (1 π) ππππ 2,5001 (1 0.0075) 60.0075ππ 2,5001 (1.0075) 60.0075π 0.0075con. period 12payment int. 12Solution for PV:To find n,π πππ. ππππππ π‘πππ ππ ππππ’ππ‘π¦1π 12 2π 6ππ 14,613.99Therefore, it is wiser to buy the televisionat P13,499 in cash
Prob 3: Mr. Tanjiro paid 200,000 as down payment for a car. Theremaining amount is to be settled by paying 16,200 at the end of eachmonth for 5 years. If interest is 10.5% compounded monthly, what is thecash price of his car? (Cash price down payment present value)Given:To find i,π 16,200π 0.105term of annuity 5π πππ‘π ππ οΏ½οΏ½ππ πππ ππππππππ π 0.10512ππ π 0.00875con. period 12payment int. 12ππ π 1 (1 π) ππSolution for PV:To find n,1 (1 π) ππ π1 (1 0.00875) 6016,2000.00875ππ 16,2001 (1.00875) 600.00875ππ 753,702.20π πππ. ππππππ π‘πππ ππ ππππ’ππ‘π¦πππ β πππππ 200,000 753.702.20π 12 5π 60πππ β πππππ 953,702.20
Prob 4: Suppose that you vow to save 500 a month for the next threeyears, with your first deposit one month from today. If your savings canearn 3% converted monthly, determine the total in your account 3 yearsfrom now.Given:To find i,π 500π 0.03term of annuity 3π πππ‘π ππ οΏ½οΏ½ππ πππ πππππππ 0.0312πΉπ π (1 π)π 1ππΉπ π (1 π)π 1ππΉπ 500(1 0.0025)36 10.0025πΉπ 500(1.0025)36 10.0025π 0.0025con. period 12payment int. 12Solution for FV:To find n,π πππ. ππππππ π‘πππ ππ ππππ’ππ‘π¦π 12 3π 36πΉπ 18,810.28
Prob 5: A retired employee wished to get 15,000 every month for 10years from her savings deposit. If the money is worth 12% compoundedmonthly, how much should her money be in the account in order to getthe desired amount?Given:To find i,π 15,000π 0.12term of annuity 10π πππ‘π ππ οΏ½οΏ½ππ πππ ππππππππ π 0.1212ππ π 0.01con. period 12payment int. 12ππ π 1 (1 π) ππSolution for PV:To find n,π πππ. ππππππ π‘πππ ππ ππππ’ππ‘π¦π 12 10π 1201 (1 π) ππ π1 (1 0.01) 12015,0000.01ππ 15,0001 (1.01) 1200.01ππ 1,045,507.83
GENERAL ANNUITY
STEPS IN SOLVING GENERAL ANNUITY1. convert the regular/periodic payment in general annuity intoits equivalent regular/periodic payment in simple annuity withrespect to the interest period;2. then use the formula for simple annuity.
Formula for General AnnuityB Rπ(1 π)π 1FV R(1 π)π 1πPV R1 (1 π) ππwhere:B Periodic Payment (in simple interest)R Periodic payment in the given general annuity problemi rate of interest per conversion period πππ‘π ππ οΏ½οΏ½ππ πππ ππππππk interest conversion period in a year divided payment interval also in a yeark πππ‘ππππ π‘ ππππ£πππ πππ οΏ½οΏ½ πππ‘πππ£ππ
Prob 6: Nami deposits 1,000 at the end of each quarter in her savingsaccount earning interest rate of 3.6% compounded monthly. How muchwill she have in 5 years?Given:To find i,π 1,000π ππππ£πππ πππ πππππππ 0.036π term of annuity 5π 0.003con. period 12payment int. 4B Rπ(1 π)π 1Solution for B:πππ‘π ππ πππ‘ππππ π‘0.03612To find k,π ππππ£πππ πππ οΏ½οΏ½ πππ‘πππ£πππ 124π 3B Rπ(1 π)π 1B (1,000)(0.003)(1 0.003)3 1Solution for FV:π΅ π 332.34To find n,π πππ. ππππππ. π‘πππ ππ ππππ’ππ‘π¦π 12 5π 60πΉπ π (1 π)π 1ππΉπ 332.34(1 0.003)60 10.003πΉπ 332.34(1.003)60 10.003πΉπ 21,812.01
Prob 7: Sanji Vinsmoke borrowed an amount of money from Luffy. Heagrees to pay the principal plus interest by paying 38,973.76 each yearfor 3 years. How much money did he borrow if interest is 8%compounded quarterly?Given:To find i,π 38,973.76π ππππ£πππ πππ πππππππ 0.08π term of annuity 3π 0.02con. period 4payment int. 1B Rπ(1 π)π 1Solution for B:πππ‘π ππ πππ‘ππππ π‘0.084To find k,π ππππ£πππ πππ οΏ½οΏ½ πππ‘πππ£πππ 41π 4B Rπ(1 π)π 1B (38,973.76)(0.02)(1 0.02)4 1Solution for PV:π΅ π 9,455.96To find n,π πππ. ππππππ. π‘πππ ππ ππππ’ππ‘π¦π 4 3π 12ππ π 1 (1 π) ππππ 9,455.961 (1 0.02) 120.02ππ 9,455.961 (1.02) 120.02ππ 100,000.00
Prob 8: Monkey D. Luffy started to deposit 300 monthly in a fund thatpays 6% compounded quarterly. How much will be in the fund after 15years?Given:To find i,π 300π ππππ£πππ πππ πππππππ 0.06π term of annuity 15con. period 4payment int. 12B Rπ(1 π)π 1Solution for B:πππ‘π ππ πππ‘ππππ π‘0.064π 0.015To find k,π ππππ£πππ πππ οΏ½οΏ½ πππ‘πππ£πππ 4121π 3B B Solution for FV:Rπ(1 π)π 1(300)(0.015)1(1 0.015)3 1π΅ π 904.49To find n,π πππ. ππππππ. π‘πππ ππ ππππ’ππ‘π¦π 4 15π 60πΉπ π (1 π)π 1ππΉπ 904.49(1 0.015)60 10.015πΉπ 904.49(1.015)60 10.015πΉπ 87,025.19
DEFERRED ANNUITY
TERMINOLOGYDeferred Annuity- an annuity in which the first periodic payment is made after a certain interval of time,known as the deferral periodOrdinary Deferred Annuity- when deferral period ends one payment interval before the first periodic payment.The future value of a deferred annuity- is the accumulated value of the stream of payments at the end of the annuity period. Thisis the same procedure as future value of an ordinary annuity (both simple and generalannuity).The present value of a deferred annuity- is the discounted value of the stream of payments at the beginning of the deferral period.
Ordinary Deferred AnnuityPVdef Rwhere:1 (1 π) ππ(1 π)πFORMULA(1 π)π 1FVdef RπPVdef present value of deferred annuityFVdef future value of deferred annuityR amount of periodic paymenti rate of interest per conversion periodn number of paymentd number of deferred period
DETERMINE THEPERIOD OF DEFERRAL(Assume the annuities are Ordinary) Payments of 1,000 at the end of each year for ten years with the firstpayment made three years from now.period of deferral 2 Payments of 5,000 at the end of every 6 months for 15 years with thefirst payment made 5 years from nowperiod of deferral 9
DETERMINE THEPERIOD OF DEFERRAL(Assume the annuities are Ordinary) A second hand car sells for 120,000 down payment and 24 monthly paymentsof 7,000 each, the first payment being due at the end of the 6th month. Find thecash price if the interest rate is 8% compounded monthly.period of deferral 5 A quarterly payment of 8,500 at 6% compounded quarterly, the first payment isdue in 1 year and 6 months and the last payment is at the end of 5 years.period of deferral 5
Prob 9: A second hand car sells for 120,000 down payment and 24monthly payments of 7,000 each, the first payment being due at theend of the 6th month. Find the cash price if the interest rate is 8%compounded monthly. (Cash price down payment present value)Given:To find i,π 7,000π 0.08term of annuity 2con. period 12payment int. 12π 5PVdef R1 (1 π) ππ(1 π)ππ πππ‘π ππ οΏ½οΏ½ππ πππ πππππππ 0.0812Retain i, since the answeris repeatingSolution for PV:PVdef R1 (1 π) ππ(1 π)πPVdef 7,0000.08 241 1 120.080.08 51 1212PVdef 149,716.28To find n,π πππ. ππππππ π‘πππ ππ ππππ’ππ‘π¦πππ β πππππ 120,000 149,716.28π 12 2π 24πππ β πππππ 269,716.28
Prob 10: If money is worth 9% compounded semi-annually, find thepresent value of 6 semi-annual payments of 10,000 each, the firstpayment is due in 4 years.Given:To find i,π 10,000π 0.09term of annuity 6con. period 2payment int. 2π 7PVdef R1 (1 π) ππ(1 π)ππ πππ‘π ππ οΏ½οΏ½ππ πππ ππππππPVdef Rπ 0.092PVdef 10,0001 1 0.045 120.045 1 0.045 7PVdef 10,0001 1.045 120.045 1.045 7π 0.045To find n,π πππ. ππππππ π‘πππ ππ ππππ’ππ‘π¦1 (1 π) ππ(1 π)πSolution for PV:π 2 6π 12PVdef 67,005.93
Prob 11: Find the present value of 24 annual payments of 20,000each, the first payment is due after 3 years and the interest rate is 9%compounded annually.Given:To find i,π 20,000π 0.09term of annuity 24con. period 1payment int. 1π 2PVdef R1 (1 π) ππ(1 π)ππ πππ‘π ππ οΏ½οΏ½ππ πππ ππππππPVdef Rπ 0.091PVdef 20,0001 1 0.09 240.09 1 0.09 2PVdef 20,0001 1.09 240.09 1.09 2π 0.09To find n,π πππ. ππππππ π‘πππ ππ ππππ’ππ‘π¦1 (1 π) ππ(1 π)πSolution for PV:π 1 24π 24PVdef 163,397.22
Ordinary Deferred Annuity - when deferral period ends one payment interval before the first periodic payment. The future value of a deferred annuity - is the accumulated value of the stream of payments at the end of the annuity period. This is the same procedure as future value of an ordinary annuity (both simple and general annuity).
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