Question
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The following money market account rates were available from a particular bank. Find the compound amount and the interest earned. \( \$ 75,000 \) at \( 0.91 \% \) compounded quarterly for nine years The compound amount is \( \$ \square \). (Do not round until the final answer. Then round to the nearest cent as needed.) The amount of interest earned is \( \$ \square \). (Do not round until the final answer. Then round to the nearest cent as needed.)

Ask by Craig Pena. in the United States
Feb 20,2025

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Tutor-Verified Answer

Answer

The compound amount is $81,393.08, and the interest earned is $6,393.08.

Solution

We start with the compound interest formula:   A = P × (1 + r/n)^(n·t) where   P = $75,000 (the principal),   r = 0.91% = 0.0091 (annual interest rate),   n = 4 (compounded quarterly), and   t = 9 years. Step 1. Find the periodic interest rate:   r/n = 0.0091 / 4 = 0.002275 Step 2. Determine the total number of compounding periods:   n·t = 4 × 9 = 36 Step 3. Substitute into the formula:   A = 75000 × (1 + 0.002275)^36     = 75000 × (1.002275)^36 Step 4. Use a calculator (without rounding until the final answer) to compute:   (1.002275)^36 ≈ 1.085241 Thus,   A ≈ 75000 × 1.085241 ≈ 81,393.08 This is the compound amount. Step 5. The interest earned is the compound amount minus the initial principal:   Interest = A − P   Interest ≈ 81,393.08 − 75,000 ≈ 6,393.08 Rounded to the nearest cent:   Compound amount: $81,393.08   Interest earned: $6,393.08 Final Answers:   The compound amount is $81,393.08.   The amount of interest earned is $6,393.08.

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The Deep Dive

To find the compound amount and the interest earned on a money market account, 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 amount of money). - \(r\) is the annual interest rate (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. For your case: - \(P = 75,000\) - \(r = 0.0091\) (0.91% as a decimal) - \(n = 4\) (quarterly compounding) - \(t = 9\) Plugging in the values: \[ A = 75000 \left(1 + \frac{0.0091}{4}\right)^{4 \times 9} \] Calculating: \[ A = 75000 \left(1 + 0.002275\right)^{36} \] \[ A = 75000 \left(1.002275\right)^{36} \] \[ A = 75000 \left(1.087196\right) \approx 81539.70 \] Now, the interest earned: \[ \text{Interest} = A - P = 81539.70 - 75000 \approx 6539.70 \] The compound amount is \( \$ 81,539.70 \). The amount of interest earned is \( \$ 6,539.70 \).

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