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\begin{tabular}{l} Suppose Justin places \( \$ 3000 \) in an account that pays \( 3 \% \) interest compounded each year. \\ Assume that no withdrawals are made from the account. \\ Follow the instructions below. Do not do any rounding. \\ (a) Find the amount in the account at the end of 1 year. \\ \( \$ \square \) \\ \hline (b) Find the amount in the account at the end of 2 years. \\ \( \$ \square \)\end{tabular}

Ask by Parry Kelley. in the United States
Mar 01,2025

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Answer

At the end of 1 year, the account has $3090. At the end of 2 years, it has $3182.70.

Solution

We use the compound interest formula:   A = P(1 + r)ⁿ where   P = initial amount,   r = annual interest rate (in decimal form),   n = number of years. (a) At the end of 1 year:   P = 3000, r = 0.03, n = 1   A = 3000(1 + 0.03)¹ = 3000(1.03) = 3090 (b) At the end of 2 years:   P = 3000, r = 0.03, n = 2   A = 3000(1 + 0.03)² = 3000(1.03)² = 3000(1.0609) = 3182.7 Thus, the amounts in the account are:   (a) $3090   (b) $3182.7

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To find the amounts in the account at the end of each year with compound interest, 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 amount of money). - \( r \) is the annual interest rate (decimal). - \( n \) is the number of years the money is invested or borrowed. Given: - \( P = 3000 \) - \( r = 0.03 \) (a) For 1 year (\( n = 1 \)): \[ A = 3000(1 + 0.03)^1 = 3000(1.03) = 3090 \] So at the end of 1 year, the amount in the account is \( \$3090 \). (b) For 2 years (\( n = 2 \)): \[ A = 3000(1 + 0.03)^2 = 3000(1.03)^2 = 3000(1.0609) = 3182.70 \] So at the end of 2 years, the amount in the account is \( \$3182.70 \).

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