Mullineaux Corporation has a target capital structure of 70 percent common stock, 10 percent preferred stock, and 20 percent debt. Its cost of equity is 12 percent, the cost of preferred stock is 6 percent, and the pretax cost of debt is 8 percent. The relevant tax rate is 40 percent.
a. What is the company’s WACC?
b. What is the aftertax cost of debt?