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 - Review Exercises and Problems for Chapter Four - Page 180: 67

Answer

a) $\$ 7401.22$ b) $\$ 7459.12$

Work Step by Step

We are given an initial invest of $P_0=5000$, and an interest rate of $4 \%$ per year. a) If interest is compounded annually, we have $P=5000(1.04)^t$. After $t= 10$ years, the amount in the account is $5000(1.04)^{10}= \$ 7401.22$. b) If interest is compounded continuously, we have $P=5000 e^{0.04 t}$. After $t= 10$ years, the amount in the account is $5000 e^{0.04(10)}=\$ 7459.12$. This is expected, the account contains more money if the interest is compounded continuously.
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