Pfizer's cost of common stock is 9.60%, cost of preferred stock is 13.00% and its cost of debt is 6.20%. The optimal capital structure is 25% common stock, 45% preferred stock and 30% of debt. The marginal tax rate is 20%. What is the WACC for Phizer? 9.4596 9.7496 10.03% 10.11% O 9.06%