A company has financed $40\%$ of its assets through a $12\%$ after$-$tax cost of debt loan. The remainder of its assets are financed through equity. The firm$$s required return on equity is $14\%.$

Calculate the company's weighted average cost of capital $($WACC$)?$

a$.$

$13\mathrm{.}75\%$

b$.$

$13\mathrm{.}20\%$

c$.$

$13\mathrm{.}56\%$

d$.$

$15\mathrm{.}50\%$