Suppose today is January 1, 2009. On January 1, 1999, MAM Industries issued a 30-year bond with a 9% coupon and a $1,000 face value, payable on January 1, 2029. The bond now sells for $915. (4.2) Suppose MAM Industries also issued a 30-year bond five years ago-it has a $1,000 face value and a 10% coupon. (4.2a) If the bond currently sell for $1,000, what is the after-tax costs of debt capital, as indicated by the market value of this outstanding bond? (4.2b) Suppose five years from now the MAM bond described in 4.2a has a market price of S1,100. What is the after-tax cost of debt capital at that time