Rogers Corp. has a cost of equity of $10\mathrm{.}9\%.$

The company has an after$-$tax cost of debt of $4\mathrm{.}6\%$

Suppose that the corporate tax rate is $40\%$ and that the company's debt$-$to$-$equity ratio is $0\mathrm{.}70,$ what is the WACC of Rogers?

Group of answer choices

$6\mathrm{.}11\%$

$8\mathrm{.}31\%$

$7\mathrm{.}17\%$

$7\mathrm{.}55\%$

None of the above