Yield Corporate Tax Rate Aftertax Cost of Debt

a$.$ yield$-9\mathrm{.}0\%$ Corporate tax rate$-33\%?\%$

b$.$ yield$-15\mathrm{.}0\%$ Corporate tax rate$-35\%?\%$

c$.$ yield$-7\mathrm{.}3\%$ Corporate tax rate$-40\%?\%$

Note: Do not round intermediate calculations. Input your answers as a percent rounded to $2$ decimal places.