Wentworth's Five and Dime Store has a cost of equity of $10\mathrm{.}5$ percent. The company has an aftertax cost of debt of $4\mathrm{.}1$ percent, and the tax rate is $21$ percent. If the company's debt$-$equity ratio is $\mathrm{.}65,$ what is the weighted average cost of capital?

Multiple Choice

$6\mathrm{.}35\%$

$5\mathrm{.}75\%$

$7\mathrm{.}98\%$

$7\mathrm{.}41\%$

$6\mathrm{.}93\%$