A company$$s capital structure is $60\%$ equity and $40\%$ debt. The company has a required return on equity of $18\%$ and an average interest rate on its debt of $8\%.$ With a $30\%$ average tax rate, what is this company$$s weighted average cost of capital?

Group of answer choices

$12\mathrm{.}47\%$

$13\mathrm{.}04\%$

$13\mathrm{.}32\%$

$13\mathrm{.}86\%$