Fundamentals of Corporate Finance
Fundamentals of Corporate Finance
11th Edition
ISBN: 9780077861704
Author: Stephen A. Ross Franco Modigliani Professor of Financial Economics Professor, Randolph W Westerfield Robert R. Dockson Deans Chair in Bus. Admin., Bradford D Jordan Professor
Publisher: McGraw-Hill Education
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Chapter 5, Problem 5QP
Summary Introduction

To determine: The number of periods of investment

Introduction:

The future value of money refers to the amount of dollars that an investment grows over a definite period at a particular rate of interest rate. The value increases based on the period of investment. The value of the investment will be higher if the duration of investment is longer.

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Answer to Problem 5QP

The number of periods is as follows:

ParticularsPresent valueYearsInterest RateFuture value
Investment A$56015.596%$1,389
Investment B$8109.409%$1,821
Investment C$18,40026.4111%$289,715
Investment D$21,50024.5213%$430,258

Explanation of Solution

Given information:

Investment A has a present value of $560, future value of $1,369, and an interest rate of 6 percent. Investment B has a present value of $810, future value of $1,821, and an interest rate of 9 percent.

Investment C has a present value of $18,400, future value of $289,715, and an interest rate of 11 percent. Investment D has a present value of $21,500, future value of $430,258, and an interest rate of 13 percent.

Formula:

Derive the formula to calculate the number of periods from the present value equation as follows:

PV=FV(1+r)t(1+r)t=FVPVln(1+r)t=ln(FVPV)

The power rule of naturallogarithm states that[ln(xy) = y× ln(x)] Hence,t×ln(1+r)=ln(FVPV)Divide the right hand side and left hand side byln(1+r)

t×ln(1+r)ln(1+r)=ln(FVPV)ln(1+r)t=ln(FVPV)ln(1+r)

The formula to calculate the number of periods:

t=ln(FVPV)ln(1+r)

Where,

“t” refers to the number of years or periods of investment

“ln” refers to the log value

“FV” refers to the future value

“PV” refers to the present value

“r” refers to the simple rate of interest

Compute the number of periods for Investment A:

t=ln($1,389$560)ln(1+0.06)=ln(2.44)ln(1.06)=15.59 years

Hence, the number of periods of Investment A is 15.59 years.

Compute the number of periods for Investment B:

t=ln($1,821$810)ln(1+0.09)=ln(2.24)ln(1.09)=9.40 years

Hence, the number of periods of Investment B is 9.40 years.

Compute the number of periods for Investment C:

t=ln($289,715$18,400)ln(1+0.11)=ln(15.75)ln(1.11)=26.41 years

Hence, the number of periods of Investment C is 26.41 years.

Compute the number of periods for Investment D:

t=ln($430,258$21,500)ln(1+0.13)=ln(20.01)ln(1.13)=24.52 years

Hence, the number of periods of Investment D is 24.52 years.

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