The AV Power Supply Company$$s stock has a beta of $0\mathrm{.}90.$ If the current risk$-$free rate is $4\mathrm{.}5\%$ and the expected return on the stock market as a whole is $13\%,$ determine the cost of equity capital for the firm.

Question $32$ options:

$13\mathrm{.}0\%$

$6\mathrm{.}5\%$

$7\mathrm{.}6\%$

$12\mathrm{.}15\%$