Marysa Corp. issued a $25-$year, $10$ percent semiannual bond $3$ years ago. The bond currently sells for $93$ percent of its face value. The company$$s tax rate is $24$ percent.

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