J&R Renovation, Inc., is trying to determine its cost of debt. The firm has a debt issue outstanding with $18$ years to maturity that is quoted at $108$ percent of face value. The issue makes semiannual payments and has a coupon rate of $5$ percent annually.

a$.$ What is the company's 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$.$ If the tax rate is $25$ percent, 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$.,32\mathrm{.}16.)$