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Multiple Choice
Which of the following equations correctly calculates the future value (FV) of $15,000 invested at an annual interest rate of 15% compounded annually for 5 years?
A
FV = 15{,}000 \times (1 - 0.15)^5
B
FV = 15{,}000 \times (1 + 0.15 \times 5)
C
FV = 15{,}000 \times (1 + 0.15)^5
D
FV = 15{,}000 \div (1 + 0.15)^5
Verified step by step guidance
1
Step 1: Understand the concept of future value (FV). Future value is the value of an investment at a specific date in the future, calculated using the principle of compounding interest. The formula for FV with annual compounding is FV = PV × (1 + r)^n, where PV is the present value, r is the annual interest rate, and n is the number of years.
Step 2: Identify the given values in the problem. The present value (PV) is $15,000, the annual interest rate (r) is 15% (or 0.15 in decimal form), and the number of years (n) is 5.
Step 3: Analyze the provided equations. The correct formula for FV with annual compounding is FV = PV × (1 + r)^n. This matches the equation FV = 15,000 × (1 + 0.15)^5. The other equations provided do not correctly apply the compounding formula.
Step 4: Substitute the given values into the correct formula. Replace PV with 15,000, r with 0.15, and n with 5 in the formula FV = PV × (1 + r)^n. The equation becomes FV = 15,000 × (1 + 0.15)^5.
Step 5: Explain why the other equations are incorrect. FV = 15,000 × (1 - 0.15)^5 incorrectly uses subtraction instead of addition, FV = 15,000 × (1 + 0.15 × 5) assumes simple interest rather than compounding, and FV = 15,000 ÷ (1 + 0.15)^5 incorrectly divides instead of multiplying.