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Multiple Choice
Charlie invests \$5,000 in an account that earns 6\% annual interest, compounded annually. Which of the following amounts is closest to the value of Charlie’s investment after 40 years?
A
\$32,000
B
\$51,429
C
\$12,000
D
\$18,000
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1
Understand the problem: Charlie's investment grows with compound interest. The formula for compound interest is \( A = P(1 + r)^t \), where \( A \) is the future value, \( P \) is the principal amount, \( r \) is the annual interest rate, and \( t \) is the time in years.
Identify the given values: \( P = 5000 \), \( r = 0.06 \) (6% annual interest), and \( t = 40 \) years. Substitute these values into the formula.
Break down the formula substitution: \( A = 5000(1 + 0.06)^{40} \). First, calculate \( 1 + 0.06 \), which equals \( 1.06 \). Then raise \( 1.06 \) to the power of \( 40 \).
Multiply the result of \( 1.06^{40} \) by \( 5000 \) to find the future value of Charlie's investment.
Compare the calculated future value to the provided options \( \{32000, 51429, 12000, 18000\} \) and determine which is closest to the computed value.