Question

In: Economics

What equal annual amount must be deposited for 10 years in order to provide withdrawals of...

What equal annual amount must be deposited for 10 years in order to provide withdrawals of $200 at the end of the second year and increasing by 25% per year until the end of tenth year? The interest rate is 10% compounded annually.

Solutions

Expert Solution

ANSWER:

Increase in withdrawals by 25%

YEAR 0 1 2 3 4 5 6 7 8 9 10
WITHDRAWAL 200 250 312.5 390.625 488.28125 610.3515625 762.9394531 953.6743164 1192.092896

Now we will find the present value of this cash flow at 10%

pv = cash flow in year 2(p/f,i,n) + cash flow in year 3(p/f,i,n) + cash flow in year 4(p/f,i,n) + cash flow in year 5(p/f,i,n) + cash flow in year 6(p/f,i,n) + cash flow in year 7(p/f,i,n) + cash flow in year 8(p/f,i,n) + cash flow in year 9(p/f,i,n) + cash flow in year 10(p/f,i,n)

pv = 200(p/f,10%,2) + 250(p/f,10%,3) + 312.5(p/f,10%,4) + 390.625(p/f,10%,5) + 488.28(p/f,10%,6) + 610.35(p/f,10%,7) + 762.93(p/f,10%,8) + 953.67(p/f,10%,9) + 1,192.09(p/f,10%,10)

pv = 200 * 0.8264 + 250 * 0.7513 + 312.5 * 0.683 + 390.625 * 0.6209 + 488.28 * 0.5645 + 610.35 * 0.5132 + 762.93 * 0.4665 + 953.67 * 0.4241 + 1,192.09 * 0.3855

pv = 165.29 + 187.83 + 213.44 + 242.55 + 275.62 + 313.21 + 355.92 + 404.45 + 459.6

pv = 2,617.91

now we will find the annual equivalent amount.

aw = pv(a/p,i,n)

aw = 2,617.91(a/p,10%,10)

aw = 2,617.91 * 0.1627

aw = 426.05

so the annual equal amount that needs to be deposited is $426.05


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