$.$ Calculating Cost of Debt For the firm in Problem $6,$ suppose the book

value of the debt issue is $$135$ million. In addition, the company has a

second debt issue, a zero coupon bond with $12$ years left to maturity; the

book value of this issue is $$65$ million, and it sells for $64\mathrm{.}3$ percent of par.

What is the total book value of debt? The total market value? What is the

aftertax cost of debt now?