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Marcus receives an inheritance of \( \$ 9,000 \). He decides to invest this money in a 12 -year certificate of deposit (CD) that pays \( 7.0 \% \) interest compounded monthly. How much money will Marcus receive when he redeems the CD at the end of the 12 years? Marcus will receive \( \$ \square \) (Round to the nearest cent.)

Ask by Newton Gray. in the United States
Mar 09,2025

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Tutor-Verified Answer

Answer

Marcus will receive approximately \$20,795.40 when he redeems the CD after 12 years.

Solution

Marcus invests an initial amount of \[ P = \$9,\!000 \] at an annual interest rate of \[ r = 7.0\% = 0.07 \] compounded monthly over \[ t = 12 \quad \text{years}. \] Since the interest is compounded monthly, the number of compounding periods per year is \[ n = 12. \] The formula for compound interest is \[ A = P\left(1 + \frac{r}{n}\right)^{nt}. \] Substitute the values into the formula: \[ A = 9000\left(1 + \frac{0.07}{12}\right)^{12 \cdot 12} = 9000\left(1 + \frac{0.07}{12}\right)^{144}. \] Now, calculate the monthly interest rate: \[ \frac{0.07}{12} \approx 0.00583333. \] Thus: \[ A = 9000 \left(1.00583333\right)^{144}. \] To evaluate the exponentiation, take the natural logarithm: \[ \ln\left(1.00583333^{144}\right) = 144 \ln\left(1.00583333\right). \] An approximate computation gives: \[ \ln(1.00583333) \approx 0.005816 \quad \Longrightarrow \quad 144 \times 0.005816 \approx 0.8375. \] Then: \[ \left(1.00583333\right)^{144} \approx e^{0.8375} \approx 2.3106. \] Therefore, \[ A \approx 9000 \times 2.3106 \approx 20795.4. \] Rounded to the nearest cent, Marcus will receive approximately \[ \boxed{\$20,\!795.40}. \]

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To determine how much money Marcus will receive when he redeems the CD at the end of 12 years, you can use the formula for compound interest: \[ A = P \left(1 + \frac{r}{n}\right)^{nt} \] Where: - \( A \) is the amount of money accumulated after n years, including interest. - \( P \) is the principal amount (the initial money). - \( r \) is the annual interest rate (in decimal). - \( n \) is the number of times that interest is compounded per year. - \( t \) is the number of years the money is invested or borrowed. Plugging in the values: - \( P = 9000 \) - \( r = 0.07 \) - \( n = 12 \) (compounded monthly) - \( t = 12 \) Now, substituting those values into the formula: \[ A = 9000 \left(1 + \frac{0.07}{12}\right)^{12 \times 12} \] Calculating: \[ A = 9000 \left(1 + \frac{0.07}{12}\right)^{144} \] \[ A = 9000 \left(1 + 0.00583333\right)^{144} \] \[ A = 9000 \left(1.00583333\right)^{144} \] \[ A \approx 9000 \times 2.296613 \] \[ A \approx 20669.52 \] So, rounding to the nearest cent, Marcus will receive approximately **$20,669.52** when he redeems the CD at the end of 12 years.

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