Question
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How much would you have to deposit in an account with a \( 9 \% \) interest rate, compounded continuously, to have \( \$ 1500 \) in your account 5 years later? \[ P=\$[?] \] Round to the nearest cent.

Ask by Norton Romero. in the United States
Jan 24,2025

Real Tutor Solution

Tutor-Verified Answer

Answer

You need to deposit \$956.44 today to have \$1,500 in your account after 5 years with a 9% continuously compounded interest rate.

Solution

To determine how much you need to deposit today (\( P \)) to have \$1,500 in your account after 5 years with a continuously compounded interest rate of 9%, we can use the formula for continuous compounding: \[ A = P \cdot e^{rt} \] Where: - \( A \) is the future amount (\$1,500), - \( r \) is the annual interest rate (0.09), - \( t \) is the time in years (5), - \( e \) is the base of the natural logarithm (approximately 2.71828). **Step-by-Step Calculation:** 1. **Rearrange the Formula to Solve for \( P \):** \[ P = \frac{A}{e^{rt}} \] 2. **Plug in the Known Values:** \[ P = \frac{1500}{e^{0.09 \times 5}} = \frac{1500}{e^{0.45}} \] 3. **Calculate \( e^{0.45} \):** \[ e^{0.45} \approx 1.5683 \] 4. **Compute \( P \):** \[ P = \frac{1500}{1.5683} \approx 956.44 \] **Final Answer:** \[ P = \$956.44 \]

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The Deep Dive

To find out how much you need to deposit initially, you can use the formula for continuous compounding, which is given by: \[ A = Pe^{rt} \] Here, \( A \) is the amount of money accumulated after n years, including interest. \( P \) is the principal amount (the initial sum of money). \( r \) is the annual interest rate (decimal), and \( t \) is the time the money is invested for in years. In your case, you want to solve for \( P \): \[ 1500 = P e^{0.09 \times 5} \] Calculating \( e^{0.45} \) (since \( 0.09 \times 5 = 0.45 \)) gives you approximately 1.5683. So, we can rewrite the equation as: \[ 1500 = P \times 1.5683 \] Now, divide both sides by 1.5683: \[ P = \frac{1500}{1.5683} \approx 955.66 \] Therefore, you would need to deposit approximately \( \$955.66 \) to have \( \$1500 \) in 5 years.

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