Calculating Cost of Debt $[$LO$2]$ Jiminy's Cricket Farm issued a $30-$year, $4\mathrm{.}5$ percent semiannual bond three years ago. The bond currently sells for $104$ percent of its face value. The company's tax rate is $22$ percent.

a$.$ What is the pretax cost of debt?

b$.$ What is the aftertax cost of debt?