Here is a condensed version of your firm's balance sheet:
Total Liabilities $30, 000, 000
Preferred Stock 10, 000, 000
Common Stock 60, 000, 000
Total Assets $100, 000, 000 Total Liabilities & Equity $100, 000, 000
If your firm's aftertax cost of debt is 6%, the cost of preferred stock is 10%, and the cost of common stock is 11%, what is the Weighted Average Cost of Capital (WACC)?