The market value of Fords' equity, preferred stock and debt are $ 6 billion,$ 3 billion, and $ 10 billion, respectively. Ford has a beta of 1.8, the market risk premium is 6%, and the risk-free rate of interest is 5%. Ford's preferred stock pays a dividend of $ 2.50 each year and trades at a price of $ 29 per share. Ford's debt trades with a yield to maturity of 10%. What is Ford's weighted average cost of capital if its tax rate is 40%?