Precalculus (10th Edition)

Published by Pearson
ISBN 10: 0-32197-907-9
ISBN 13: 978-0-32197-907-0

Chapter 5 - Exponential and Logarithmic Functions - 5.7 Financial Models - 5.7 Assess Your Understanding - Page 321: 17

Answer

$\$860.72$

Work Step by Step

According to the Compound Interest Formula, where $P$ is the principal, the amount deposited, $r$ is the annual interest rate, $n$ is the number of times the interest is compounded annually, $t$ is the number of years, $A$ is the amount you get back after $t$ years: $A=P\cdot(1+\frac{r}{n})^{n\cdot t}$ Here we have: $t=2.5\text{ years}$ $r=6\%=0.06$ $A=\$1000$ $n=365$ (since it is compounded daily) Substitute these values into the formula above to obtain: $\$1000=P\cdot\left(1+\frac{0.06}{365}\right)^{365\cdot 2.5}$ Hence, $P=\dfrac{\$1000}{\left(1+\frac{0.06}{365}\right)^{365\cdot 2.5}}\approx\$860.72$
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