Shadow Corp. has no debt but can borrow at $7\mathrm{.}9$ percent. The firm$$s WACC is currently $9\mathrm{.}7$ percent, and the tax rate is $23$ percent.

a$.$ What is the firm$$s cost of equity? $($Do not round intermediate calculations and enter your answer as a percent rounded to $2$ decimal places, e$.$g$.,32\mathrm{.}16.)$

b$.$ If the firm converts to $35$ percent debt, what will its cost of equity be$?($Do not round intermediate calculations and enter your answer as a percent rounded to $2$ decimal places, e$.$g$.,32\mathrm{.}16.)$

c$.$ If the firm converts to $50$ percent debt, what will its cost of equity be$?($Do not round intermediate calculations and enter your answer as a percent rounded to $2$ decimal places, e$.$g$.,32\mathrm{.}16.)$

d$-1.$ If the firm converts to $35$ percent debt, what will the company's WACC be$?($Do not round intermediate calculations and enter your answer as a percent rounded to $2$ decimal places, e$.$g$.,32\mathrm{.}16.)$

d$-2.$ If the firm converts to $50$ percent debt, what will the company's WACC be$?($Do not round intermediate calculations and enter your answer as a percent rounded to $2$ decimal places, e$.$g$.,32\mathrm{.}16.)$