The formula for the effective annual rate (EAR) is:
$$EAR = (1 + \frac{r}{n})^{nt} - 1$$
Where $r$ is the nominal interest rate, $n$ is the number of compounding periods per year, and $t$ is the number of years. In this case, $r = 0.09$, $n = 12$, and $t =
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