Chapter 4.4, Problem 75E

### Calculus: An Applied Approach (Min...

10th Edition
Ron Larson
ISBN: 9781305860919

Chapter
Section

### Calculus: An Applied Approach (Min...

10th Edition
Ron Larson
ISBN: 9781305860919
Textbook Problem
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# Compound Interest A deposit of $1000 is made in an account that earns interest at an annual rate of 5%. How long will it take for the balance to double when the interest is compounded (a) annually, (b) monthly, (c) daily, and (d) continuously? (a) To determine To calculate: The time required so that the deposited amount become double if the amount of$1000 is deposited in an account at the interest rate of 5% and the interest is compounded annually.

Explanation

Given Information:

The amount of $1000 is deposited in an account at the interest rate of 5% and the interest is compounded annually. Formula used: The compound interest formula, A=P(1+rn)nt Where, P is the deposited amount, A is the amount after t years, r is the interest rate in decimals, t is the number of years and n is the number of times compounded per year. The property of logarithms for the expression lnxn is lnxn=nlnx where x and y are real numbers greater than 0. Calculation: Consider that the amount of$1000 is deposited in an account at the interest rate of 5% and the interest is compounded annually.

Since, the principal amount deposit in the account is $1000 at interest rate of P=$1000, r=5%.

The number of times compounded per year is 1 as the interest is compounded annually, that is,

n=1.

Now, the amount become double of the deposited amount after t years, then the amount after t years is 2P, that is,

A=2P=2($1000)=$2000

The rate of interest compounded annually is,

r=5%=5100=0.05

Substitute 0.05 for i, $1000 for P, 1 for n, and$2000 for A in A=P(1+rn)nt

(b)

To determine

To calculate: The time required so that the deposited amount become double if the amount of $1000 is deposited in an account at the interest rate of 5% and the interest is compounded monthly. (c) To determine To calculate: The time required so that the deposited amount become double if the amount of$1000 is deposited in an account at the interest rate of 5% and the interest is compounded daily.

(d)

To determine

To calculate: The time required so that the deposited amount become double if the amount of \$1000 is deposited in an account at the interest rate of 5% and the interest is compounded continuously.

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