Question

Perpetuity X has an annual payments of 1,2,3,..., at the end of each year. Perpetuity Y has an annual payments of p, p, 2p, 2

The answer should be 1.9524

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Answer #1

The present value of Perpetuity X can be determined as follows

PIx = + + +....੨

PWx = 1(P/A, 5%,0) +1(P/G,5%,00)

-1 = PWx =1x 1 - 1.05-& 0.05 O +1x 1 1.05* – 0.05 x 0 0,052 x 1,05%

— PWx=1 x 0.5 +1x 0.052

SPWY = 420

The present worth of Y can be written as

P P 2P 2P 3P 3P PWү - 1.05 * 1.052 + 1.053 + 1.054 * 1.055 + 1.056 + ..х

P(1.05) 2P(1.05 = PWy = 11.052 * 1.052 +1 1.054 3P(1.05) 3P + 1.054+ 1.056 + 1056] + ......00

2.05P 4.1P 6.15P 8.20P PWY = 1052 + 1 054 + 1 056 7 1058 - + +......

We can solve this problem by shifting the value of P

For example calculate the value of P at the end of two year

At 2 year Cash flow = P(1.05) + P = 2.05P

At year 4, CF = 2P(1.05) + 2P = 4.10P

At year 6, CF = 3P(1.05) + 3P = 6.15P

At year 8, CF = 4P(1.05)+4P = 8.20P

Like wise we can convert the cash flow of odd years into the cash flow at the end of even years.

Interest rate = 5% per year

Calculate the effective interest rate for 2 year

iefs = (1 + inom) - 1

iefs= [1 +0.05)2 – 1 = 1.1025 – 1 = 0.1025

Effective interest rate = 10.25% per two years

2.05P 4.1P 6.15P 8.20P PWY = 1.1025 + 1.10252 + 1.10253 + 1.10254 + + ......

PWy = P2.05(P/A, 10.25%, +2.05(P/G, 10.25%,0)

2.05 2.05 PWy = P10 1025+ 0.10252

PWY = P20+ 195.1219512

S PWY = 215.1219512P

The present value of Y is equal to present value of X.

215.1219512P = 420

420 G P = 215.1219512

P= 1.95238

P1.9524

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