If you invest for a single period at an interest rate of r, your money will grow to (1 + r) per dollar invested.
The formula for calculating future value of an investment is:
FV = P (1 + r)^n
Where:
For example, if you invest $100 in an account that earns 10% per annum. The future value is:
$100 X ( 1 + 0.1)
$100(1.1) = $110.
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