Functions Modeling Change: A Preparation for Calculus, 5th Edition

Published by Wiley
ISBN 10: 1118583191
ISBN 13: 978-1-11858-319-7

Chapter 4 - Exponential Functions - 4.5 The Number e - Exercises and Problems for Section 4.5 - Exercises and Problems - Page 174: 37

Answer

The account paying $5.5\%$ interest compounded annually is better.

Work Step by Step

For each of the options, we can compute the account balance as follows: Continuous compounding: $$B=B_0e^{0.053t} \approx B_0(1.05443)^2,$$ the APR is approximately $5.443 \%$. Annual compounding: $$B=B_0(1.055)^t,$$ the APR is $5.5 \%$. We see that the account paying $5.5\%$ interest compounded annually is better.
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