Calculate the aftertax cost of debt under each of the following conditions. $($Do not round intermediate calculations. Round the final answers to $2$ decimal places.$)$

Yield Corporate

tax rate Cost of debt

a $8\mathrm{.}5\%23\%\%$

b $14\mathrm{.}5\%37\%\%$

c $12\mathrm{.}0\%43\%\%$