$4.$MaxVal Co$.$ has expected earnings before interest and taxes of $$5,000\mathrm{.}00.$ Its unlevered cost of capital is $11\mathrm{.}00\%$ and its tax rate is $34\mathrm{.}00\%.$ MaxVal Co$.$ has debt with both a book and a face value of $$3,000\mathrm{.}00.$ This debt has $8\%$ coupon and pays interest annually. What is the firm's weighted average cost of capital?

a$)10\mathrm{.}64\%$b $11\mathrm{.}00\%$c$)9\mathrm{.}57\%$d$)10\mathrm{.}74\%$e$)8\mathrm{.}40\%$