Answer
r = $\frac{\frac{A}{P} - 1 }{t}$
Work Step by Step
A = P(1 + rt)
To make "r" the subject,
$\frac{A}{P}$ = 1 +rt
$\frac{A}{P}$ - 1 = rt
r = $\frac{\frac{A}{P} - 1 }{t}$
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