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Multiple Choice
Which equation best represents the future value of a single sum after $n$ periods, assuming no compounding interest (i.e., using simple interest)?
A
$FV = PV \times (1 - r \times n)$
B
$FV = PV \times (1 + r \times n)$
C
$FV = PV \times (1 + r)^n$
D
$FV = PV \div (1 + r \times n)$
Verified step by step guidance
1
Understand the problem: The question is asking for the correct formula to calculate the future value (FV) of a single sum after $n$ periods, assuming simple interest. Simple interest means that interest is calculated only on the principal amount (PV) and does not compound over time.
Recall the formula for simple interest: The future value (FV) under simple interest is calculated as $FV = PV + (PV \times r \times n)$, where $r$ is the interest rate per period, and $n$ is the number of periods.
Simplify the formula: Factor out $PV$ from the equation $FV = PV + (PV \times r \times n)$ to get $FV = PV \times (1 + r \times n)$. This is the formula for the future value under simple interest.
Compare the given options: The correct formula for simple interest is $FV = PV \times (1 + r \times n)$. This matches one of the provided options.
Eliminate incorrect options: The other formulas provided either involve compounding interest (e.g., $FV = PV \times (1 + r)^n$) or are mathematically incorrect for simple interest (e.g., $FV = PV \times (1 - r \times n)$ or $FV = PV \div (1 + r \times n)$).