The formula for compound interest involves the variables A, P, r, n, and t where:

A = total amount P = principal (or starting value) r = rate as a decimal n = number of times that the interest is compounded per year t = time in years

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Algebra • Calculus

The formula for compound interest involves the variables A, P, r, n, and t where:

A = total amount P = principal (or starting value) r = rate as a decimal n = number of times that the interest is compounded per year t = time in years