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Solar Industries has a debt$-$equity ratio of $1\mathrm{.}1.$ Its WACC is $7\mathrm{.}3$ percent, and its cost of debt is $5\mathrm{.}1$ percent. The corporate tax rate is $21$ percent.

$5$ points

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

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

c$-1.$ What would the cost of equity be if the debt$-$equity ratio were $2?($Do not round intermediate calculations and enter your answer as a percent rounded to $2$ decimal places, e$.$g$.,32\mathrm{.}16.)$

c$-2.$ What would the cost of equity be if the debt$-$equity ratio were $1?($Do not round intermediate calculations and enter your answer as a percent rounded to $2$ decimal places, e$.$g$.,32\mathrm{.}16.)$

c$-3.$ What would the cost of equity be if the debt$-$equity ratio were zero? $($Do not round intermediate calculations and enter your answer as a percent rounded to $2$ decimal places, e$.$g$.,32\mathrm{.}16.)$