College Algebra (10th Edition)

Published by Pearson
ISBN 10: 0321979478
ISBN 13: 978-0-32197-947-6

Chapter 6 - Section 6.7 - Financial Models - 6.7 Assess Your Understanding - Page 475: 49

Answer

The continuous compounding at $ 5.6\%$ does not result in the needed amount. The other bank offers a better deal.

Work Step by Step

The amount A after t years due to a principal P invested at an annual interest rate r, expressed as a decimal, compounded n times per year is $A=P\displaystyle \cdot(1+\frac{r}{n})^{nt}$ If compounding is continuous, $A=Pe^{rt}$ --- Continuous compounding, $r=0.056, t=1, P=1000.$ $ A=1000e^{(0.056)(1)}={{\$}} 1057.60,$ which is not enough ( needs ${{\$}} 1060)$. The other bank offers $r=0.059, $compounded $n=12$ times per year: $A=1000\displaystyle \left(1+\frac{0.059}{12}\right)^{12}={{\$}} 1060.62,$ which is enough, so this is the better deal.
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