Pregunta
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L] Kiara deposited \( \$ 300 \) into a savings account 8 years ago. The account earns \( 7 \% \) interest, compounded annually. How much interest has she earned? Answer in dollars and round to the nearest cent.

Ask by Kirk Watson. in the United States
Feb 28,2025

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Kiara has earned approximately \$215.46 in interest.

Solución

We start with the compound interest formula:   A = P(1 + r)ᵗ where   P = initial principal = $300,   r = annual interest rate = 0.07,   t = time in years = 8. Step 1: Calculate the final amount (A)   A = 300 × (1 + 0.07)⁸     = 300 × (1.07)⁸ Step 2: Compute (1.07)⁸   (1.07)⁸ ≈ 1.718186 Step 3: Multiply by the principal   A ≈ 300 × 1.718186 ≈ 515.46 Step 4: Determine the interest earned   Interest = A – P = 515.46 – 300 = 215.46 Therefore, Kiara has earned approximately $215.46 in interest.

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Beyond the Answer

To calculate the interest earned on Kiara's savings account, we can use the formula for compound interest: \[ A = P(1 + r)^n \] where: - \( A \) 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). - \( n \) is the number of years the money is invested or borrowed for. Substituting the values into the formula: - \( P = 300 \) - \( r = 0.07 \) - \( n = 8 \) \[ A = 300(1 + 0.07)^8 \] Calculating: \[ A = 300(1.07)^8 \] \[ A = 300 \times 1.718186 \] \[ A \approx 515.46 \] Now, to find the interest earned, we subtract the principal from the total amount: \[ \text{Interest} = A - P \] \[ \text{Interest} \approx 515.46 - 300 \] \[ \text{Interest} \approx 215.46 \] So, Kiara has earned approximately \$215.46 in interest.

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