Your firm is financed using 20% debt, 30% preferred shares and 50% common shares, with the weights determined on a market value basis. The expected returns on each are 6.32% for debt on an after-tax basis, 7.55% for preferred shares and 12.21% for common shares. What is your firms weighted average cost of capital? Select one: a. 7.65% b. 8.05% c. 9.63% d. 11.22% e. None of the above