Lannister Manufacturing has a target debt$-$equity ratio of $0\mathrm{.}7.$ Its cost of equity is $18$ percent, and its cost of debt is $9$ percent. If the tax rate is $33$ percent, what is the company's WACC?

Multiple Choice

$9\mathrm{.}62\%$

$13\mathrm{.}72\%$

$12\mathrm{.}42\%$

$10\mathrm{.}96\%$

$13\mathrm{.}07\%$