Nexus Enterprises has the following data: risk$-$free rate rf$=5\%,$ market expected return is $8\%,$ and $\backslash$beta of the stock is $1\mathrm{.}5.$ What is the firm's cost of common equity based on the CAPM?

Group of answer choices

$9\mathrm{.}5\%$

$12\mathrm{.}8\%$

$15\mathrm{.}5\%$

$11\mathrm{.}3\%$

$8\mathrm{.}5\%$