solve using formulas and not excel! thanks!

1. Assume the market value of Fords' equity, preferred stock and debt are $7 billion, $4 billion and $10 billion respectively. Ford has a beta of 1.4, the market risk premium is 6% and the risk-free rate of interest is 4%. Ford's preferred stock pays a dividend of $3 each year and trades at a price of $25 per share. Ford's debt trades with a yield to maturity of 8.5%. What is Ford's weighted average cost of capital if its tax rate is 35% ? A) 7.69% B) 8.15% C) 8.60% D) 9.05% E) 7.24%