Ninecent Corporation has a target capital structure of 65 percent common stock, 10 pereent preferred stock, and 25 percent debt, its cost of equity is 13 percent, the cost of preferred stock is 6 percent, and the pretax cost of debt is 7 percent. The relevant tax rate is 25 percent. a. What is the company's WACC? Note: Do not round intermediate calculations and enter your answer as a percent rounded to 2 decimal places, e.g, 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