Answer
$12.253$
Work Step by Step
$(a+\frac{0.09}{12})^{12t}=3$
$\log_{1+\frac{0.09}{12}}3=12t$
$t=\frac{\log_{1+\frac{0.09}{12}}3}{12}$
$\approx 12.25252171$
$=12.253$
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