Charlotte's Speedway has $15,800$ shares of common stock outstanding at a price per share of $$80$ and a rate of returf of $11\mathrm{.}74$ percent. The company also has $$640,000$ bonds outstanding. The pretax cost of debt is $6\mathrm{.}23$ percent and the bonds sell for $98\mathrm{.}7$ percent of par. What is the firm's WACC if the tax rate is $21$ percent?

A$)9\mathrm{.}91\%$

B$)10\mathrm{.}34\%$

C$)9\mathrm{.}47\%$

D$)8\mathrm{.}75\%$

E$)8\mathrm{.}59\%$