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Multiple Choice
If you invest $10 today in an account that earns an annual interest rate of 5\% compounded annually, how much will you have at the end of 3 years?
A
$11.58
B
$11.50
C
$12.00
D
$15.00
Verified step by step guidance
1
Understand the concept of compound interest: Compound interest is calculated on the initial principal and also on the accumulated interest from previous periods. The formula for compound interest is: \( A = P \times (1 + r)^n \), where \( A \) is the future value, \( P \) is the principal amount, \( r \) is the annual interest rate, and \( n \) is the number of years.
Identify the given values from the problem: \( P = 10 \) (initial investment), \( r = 0.05 \) (annual interest rate expressed as a decimal), and \( n = 3 \) (number of years).
Substitute the given values into the compound interest formula: \( A = 10 \times (1 + 0.05)^3 \).
Simplify the expression inside the parentheses: \( 1 + 0.05 = 1.05 \), so the formula becomes \( A = 10 \times (1.05)^3 \).
Calculate \( (1.05)^3 \) and then multiply the result by \( 10 \) to find the future value \( A \). This will give you the amount in the account at the end of 3 years.