Sunrise, Incorporated, is trying to determine its cost of debt. The firm has a debt issue outstanding with $27$ years to maturity that is quoted at $105$ percent of face value. The issue makes semiannual payments and has an embedded cost of $4$ 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 $23$ 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$.,32\mathrm{.}16.)$