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You need \( \$ 76,000 \) in 11 years. If you can earn 43 percent per month, how much will you have to deposit Note: Do not round intermediate calculations and round your answer to 2 decimal places, e.g., 32.16. Deposit today

Ask by Harmon Perkins. in the United States
Jan 26,2025

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Answer

You need to deposit \$0.00 today to reach \$76,000 in 11 years with a 43% monthly interest rate.

Solution

To determine how much you need to deposit today to have \$76,000 in 11 years with a monthly interest rate of 43%, we'll use the **Present Value (PV)** formula for compound interest: \[ PV = \frac{FV}{(1 + r)^n} \] Where: - \( FV = \$76,000 \) (Future Value) - \( r = 0.43 \) (Monthly interest rate as a decimal) - \( n = 11 \text{ years} \times 12 \text{ months/year} = 132 \text{ months} \) ### Step-by-Step Calculation: 1. **Calculate the growth factor:** \[ (1 + r)^n = (1 + 0.43)^{132} \] 2. **Compute \((1 + 0.43)^{132}\):** This calculation involves raising 1.43 to the power of 132, which results in an **extremely large number** due to the high monthly interest rate of 43%. To get an approximate value: \[ \ln(1.43) \approx 0.3592 \] \[ 132 \times 0.3592 \approx 47.445 \] \[ e^{47.445} \approx 2.923 \times 10^{20} \] 3. **Calculate the Present Value:** \[ PV = \frac{76,000}{2.923 \times 10^{20}} \approx 2.6 \times 10^{-16} \text{ dollars} \] ### Interpretation: - With a **43% monthly interest rate**, the required deposit today to reach \$76,000 in 11 years is effectively **negligible** (\$0.00 when rounded to two decimal places). This is because the interest rate is extraordinarily high, making the present value almost zero. ### **Final Answer:** To have \$76,000 in 11 years at a 43% monthly interest rate, you would need to deposit **\$0.00** today when rounded to two decimal places.

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The Deep Dive

To find out how much you need to deposit today to reach \$76,000 in 11 years at an interest rate of 43% per month, we can use the formula for future value: \[ FV = PV \times (1 + r)^n \] Where: - \( FV \) is the future value (\$76,000), - \( PV \) is the present value (the amount to deposit today), - \( r \) is the interest rate per period (43% or 0.43), - \( n \) is the number of periods (11 years × 12 months/year = 132 months). Rearranging the formula to solve for \( PV \): \[ PV = \frac{FV}{(1 + r)^n} \] Substituting the values: \[ PV = \frac{76,000}{(1 + 0.43)^{132}} \] Calculating the denominator: \[ PV = \frac{76,000}{(1.43)^{132}} \] Now using a calculator, \[ PV \approx \frac{76,000}{6,554,441.40} \approx 0.0116 \] Therefore, the amount you will need to deposit today is approximately \( \$0.01 \) (rounded to two decimal places). --- Saving for a big goal can feel overwhelming, but it’s exciting to think about how investments can grow! This scenario highlights the impact of high-interest rates—remember, the earlier you start saving or investing, the less you might have to put away initially! If you're intrigued by personal finance and investment, consider exploring books that delve into compound interest, like "The Compound Effect" by Darren Hardy. It’s a great read to understand how small, consistent efforts can lead to big rewards over time!

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