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10 March, 01:13

Solve A = P+Prt for r. Assume all variables represent positive values.

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  1. 10 March, 01:37
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    A = P + Prt

    A = P/P + Prt/P

    A = P (1 + rt)

    A/P = P (1 + rt) / P

    A/P = 1 + rt

    A/P - 1 = 1 - 1 + rt

    A/P - 1 = rt

    (A/P - 1) / t = rt/t

    (A/P - 1) / t = r

    Thus r = (A/P - 1) / t.
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