calvert has a target capital structure of 80% of common stock, 10% of preferred stock and 10% debt. the common stock had a beta of 0.95 and recently paid a dividend of $2.50. debt includes 5.5% coupons with 25 years' maturity with a quoted price of 107% par. the 3.5% preferred stock with the par value of 100$ currently trades for 68$. the risk free rate of return in the market is 2.8%, the risk premium is 6% and the tax rate is 25%. Compute Calvert's weighted average cost of capital (WACC)