Lucent Technologies's cost of common stock is 9.40%, cost of preferred stock is 13.00% and its cost of debt is 4.20%. The optimal capital structure is 20% common stock, 50% preferred stock and 30% of debt. The marginal tax rate is 30%. What is the WACC for Lucent Technologies? 8.61% 9.54% 9.64% 9.26% 8.89%