12. Globex Corporation has a capital structure of 23 percent common stock, 10 percent preferred stock, and the rest is debt. Its cost of common equity is 12.1 percent, the cost of preferred equity is 9.6 percent, and the after-tax cost of debt is 5.5 percent, where the corporate tax rate is 21%. What is the company's WACC? a. 6.65 percent b. 7.43 percent c. 8.43 percent d. 9.62 percent e. 10.62 percent