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For a series of $n$ periodic payments accumulating interest at a rate of $r$ per period, the total compound interest is $\frac{(1-r^n)}{n(1-r)}-1$. Note that to convert an annual rate (APR) $r_{\tiny APR}$ to a monthly rate use the formula $(1+r_{\tiny APR})^\frac{1}{12}-1$.
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Tue, 19 Mar 2013 14:22 GMT