Navarro Corporation has no debt but can borrow at $5\mathrm{.}5$ percent. The firm$$s WACC is currently $9$ percent, and the tax rate is $21$ percent.

a$.$

What is the company$$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 $40$ 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 $70$ 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 $40$ percent debt, what is the company$$s WACC? $($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 $70$ percent debt, what is the company$$s WACC? $($Do not round intermediate calculations and enter your answer as a percent rounded to $2$ decimal places, e$.$g$.,32\mathrm{.}16.)$