Shadow Corp. has no debt but can borrow at $7\mathrm{.}6$ percent. The $$rm$\text{'}$s WACC is currently $9\mathrm{.}4$ percent, and the tax rate is $25$ percent.

A$.$ What is the firms cost of equity?

B$.$ If the firm converts to $20$ percent debt, what will its cost of equity be$?$

C$.$ If the firm converts to $60$ percent debt, what will its cost of equity be$?$

D$-1.$ If the firm converts to $20$ percent debt, what will the company$$s WACC be$?$

D$-2.$ If the firm converts to $60$ percent debt, what will the company$$s WACC be$?$