Calculating Cost of Debt $[$LO$2]$ For the firm in Problem $7,$ suppose the book value of the debt issue is $$95$ million. In addition, the company has a second debt issue on the market, a zero coupon bond with eight years left to maturity; the book value of this issue is $$40$ million, and the bonds sell for $67$ percent of par. What is the company's total book value of debt? The total market value? What is your best estimate of the aftertax cost of debt now?