Bombardier Inc has common stock trading at a price of $15, and a market capitalization of $8 billion. The firm also has preferred stock worth a total of $2 billion, currently trading at $23 per share and paying a dividend of $2.75 per share. The firm's beta is 0.93, the risk-free rate is 3.2%, and the market risk premium is 7%. The firm has $12 billion of debt with a yield to maturity of 5%. If the firm's tax rate is 20%, what is Bombardier's WACC? 6.8% 4.12% 8.56% 7.3% 7.57%