Mullineaux Corporation has a target capital structure of 60 percent common stock, 15 percent preferred stock, and 25 percent debt. Its cost of equity is 10 percent, the cost of preferred stock is 4 percent, and the pretax cost of debt is 6 percent. The relevant tax rate is 35 percent. a. What is the companys WACC? (Do not round intermediate calculations. Enter your answer as a percent rounded to 2 decimal places, e.g., 32.16.) WACC % b. What is the aftertax cost of debt