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Multiple Choice
Which of the following equations correctly calculates the future value ($FV$) of a single sum invested today ($PV$) for $n$ periods at an annual interest rate $r$, with interest compounded once per period?
A
$FV = PV \times (1 - r)^n$
B
$FV = PV \div (1 + r)^n$
C
$FV = PV \times r \times n$
D
$FV = PV \times (1 + r)^n$
Verified step by step guidance
1
Step 1: Understand the concept of future value (FV). Future value represents the amount of money an investment will grow to over time, given a specific interest rate and compounding period.
Step 2: Recognize the formula for future value with compound interest. The correct formula is $FV = PV \times (1 + r)^n$, where $PV$ is the present value, $r$ is the annual interest rate, and $n$ is the number of compounding periods.
Step 3: Analyze why the other formulas are incorrect. For example, $FV = PV \times (1 - r)^n$ incorrectly subtracts the interest rate, which does not reflect growth. Similarly, $FV = PV \div (1 + r)^n$ represents a discounting formula, not compounding. Lastly, $FV = PV \times r \times n$ assumes simple interest, not compound interest.
Step 4: Break down the correct formula. The term $(1 + r)^n$ accounts for compounding, where the investment grows exponentially over $n$ periods. Multiplying this by $PV$ scales the growth to the initial investment amount.
Step 5: Apply the formula to solve problems. To calculate future value, substitute the given values for $PV$, $r$, and $n$ into the formula $FV = PV \times (1 + r)^n$ and compute the result.