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\( \begin{array}{ll}\text { estion } 2 \text { (4 points) } \\ & \\ \text { Hor graduation, Emma receives } \$ 875 \text { from the money in the cards she received from family } \\ \text { and friends. } \\ \text { How would it take for Emma's money to double (grow to } \$ 1750 \text { ) if the interest is } \\ \text { compounded continuously at } 6 \% ?\end{array} \)

Ask by Schultz Gibbs. in the United States
Feb 03,2025

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Answer

It will take approximately 11.55 years for Emma's \$875 to double to \$1,750 with continuous compounding at a 6% annual interest rate.

Solution

To determine how long it will take for Emma's \$875 to double to \$1,750 with continuous compounding at an annual interest rate of 6%, we can use the formula for continuous compound interest: \[ A = P \cdot e^{rt} \] Where: - \( A \) = the amount of money accumulated after time \( t \) - \( P \) = the principal amount (\$875) - \( r \) = annual interest rate (0.06) - \( t \) = time in years - \( e \) = Euler's number (approximately 2.71828) Given: \[ 1750 = 875 \cdot e^{0.06t} \] 1. **Divide both sides by 875:** \[ 2 = e^{0.06t} \] 2. **Take the natural logarithm (ln) of both sides to solve for \( t \):** \[ \ln(2) = 0.06t \] 3. **Solve for \( t \):** \[ t = \frac{\ln(2)}{0.06} \approx \frac{0.693147}{0.06} \approx 11.55 \text{ years} \] **Conclusion:** It will take approximately **11.55 years** for Emma's \$875 to double to \$1,750 with continuous compounding at a 6% annual interest rate.

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To determine how long it will take for Emma's money to double under continuously compounded interest, we can use the formula for continuous compound interest: \( A = Pe^{rt} \). Here, \( A \) is the amount of money accumulated after time \( t \), \( P \) is the principal amount (in this case, $875), \( r \) is the annual interest rate (0.06), and \( t \) is the time in years. Setting \( A \) to $1750 gives us the equation \( 1750 = 875e^{0.06t} \). Dividing both sides by 875 gives \( 2 = e^{0.06t} \). Taking the natural logarithm of both sides allows us to solve for \( t \): \( \ln(2) = 0.06t \), leading to \( t \approx \frac{\ln(2)}{0.06} \approx 11.55 \) years. So, Emma can expect her money to double in about 11.55 years! Now, to spice things up, if Emma were to invest her money in a high-interest savings account instead, she might achieve faster growth with features like a sign-up bonus or higher rates for large deposits. However, remember that while it can be tempting to chase high yields, it’s crucial to assess the reliability and safety of such investments, evaluating terms and conditions carefully!

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