Mullineaux Corporation has a target capital structure of 50 percent common stock, 10 percent preferred stock, and 40 percent debt. Its cost of equity is 8 percent, the cost of preferred stock is 4 percent, and the pretax cost of debt is 5 percent. The relevant tax rate is 38 percent.

a.	What is the companys WACC?

b. What is the after-tax cost of debt?