In: Economics
How much must be deposited in an account to have annual withdrawals of $ 2607 forever? Interest is compounded quarterly and the interest rate is 9% for the first 13 years and 15 % thereafter.
The answer is close to
Solution:-
Given,
Amount of annuals withdrawals is $2607 per year forever.
Interest rate 9% per year for the first 13 Year and 15% thereafter compounded quarterly.
First Calculate the effective interest rate for both the time periods then use that rate to
Calculate amount of deposit required to withdraw $2607 per year forever.
Interest rate calculation is as follows.
Effective interest rate=[1+(nominal interest rate/compounding period in year)]^compounding period in year-1
=[(1+9%/4)^4-1]
=[(1+.09/4)^4-1]
=[(1+0.0225)^4-1]
=[(1.0225)^4-1]
=1.093083-1
=0.093083=9.3083%
There after 15% compounded quarterly
=[(1+15%/4)^4-1]
=[(1+.15/4)^4-1]
=[(1+0.0375)^4-1]
=[(1.0375)^4-1]
=1.158650-1
=0.1586504=15.8650%
Thus, the effective interest rate are 9.3083% and 15.8650%
Following the way to calculate the amount of initial deposite.
PV=$2607(P/A, 9.3083%,13)+$2607/ 15.8650%(P/F,9.3083,13)
=$2607[(1+i)^n-1/i(1+i)^n]+$2607*100/15.8650[1/(1+i)^n]
=$2607[(1+0.093083)^13-1/0.093083(1+0.093083)^13]+$2607*100/15.8650[1/(1+0.093083)^13]
=$2607[(1.093083)^13-1/0.093083(1.093083)^13]+260700/15.8650[1/(1.093083)^13]
=$2607[3.18046-1/0.093083(3.18046)]+16432.39836(1/3.18046)
=$2607(2.18046/0.29605)+16432.39836(0.3144)
=$2607(7.36517)+5166.346
=19200.9819+5166.346
=$24367.344
Hence, the amount of initial deposit must be $24367.344