Calculus 10th Edition

Published by Brooks Cole
ISBN 10: 1-28505-709-0
ISBN 13: 978-1-28505-709-5

Chapter 6 - Differential Equations - 6.2 Exercises - Page 413: 47

Answer

$$P \approx \$ 61,377.74$$

Work Step by Step

$$\eqalign{ & r = 8\% ,{\text{ }}t = 35 \cr & {\text{The formula for the amount }}A{\text{ in a savings account }} \cr & {\text{compounded }}n{\text{ times per year for }}t{\text{ years at an interest }} \cr & {\text{rate }}r{\text{ and an initial deposit of }}P{\text{ is given by}} \cr & A = P{\left( {1 + \frac{r}{n}} \right)^{nt}}{\text{ }}\left( {\bf{1}} \right) \cr & {\text{From the given information:}} \cr & A = 1,000,000,{\text{ }}r = 8\% = 0.08,{\text{ }}n = 12\left( {{\text{a year}}} \right),{\text{ }}t = 35 \cr & {\text{Substituting these values into }}\left( {\bf{1}} \right) \cr & \$ 1,000,000 = P{\left( {1 + \frac{{0.08}}{{12}}} \right)^{\left( {12} \right)\left( {35} \right)}} \cr & {\text{Simplifying}} \cr & \$ 1,000,000\$ \approx P{\left( {1.0066} \right)^{420}} \cr & {\text{Solve for }}P \cr & \frac{{\$ 1,000,000}}{{{{\left( {1.0066} \right)}^{420}}}} \approx P \cr & P \approx \$ 61,377.74 \cr} $$
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