Ninecent Corporation has a target capital structure of 70 percent common stock, 5 percent preferred stock, and 25 percent debt, Its cost of equity is 11 percent, the cost of preferred stock is 5 percent, and the pretax cost of debt is 6 percent. The relevant tax rate is 23 percent. a. What is the compony's WACC? Note: Do not round intermediate calculations and enter your answer as a percent rounded to 2 decimal places, e.9., 32.16. b. What is the aftertax cost of debt? Note: Do not round intermediate calculations and enter your answer as a percent rounded to 2 decimal places, e,9., 32.16