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Compound interest is an interest on interest. It is interest calculated on the principal amount and also on the accumulated interest of previous periods.
P = principal amount (the initial amount you borrow or deposit)
r = annual rate of interest (as a decimal)
t = number of years the amount is deposited or borrowed for.
A = amount of money accumulated after n years, including interest.
n = number of times the interest is compounded per year
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