A firm is financed 55% by common stock, 10% by preferred stock and 35% by debt. The required return is 15% on the common, 10% on the preferred, and 8% on the debt. If the tax rate is 21% what is the WACC? Seleccione una: : a. 10.72% b. 11.46% c. 11.70% d. 12.05%