A firm has $8 Billion debt outstanding, with a yield to maturity of 4.9% and a coupon rate of 4.2%. They have 128 million preferred shares outstanding, currently trading at $95.51. They also have 809 million common shares outstanding, currently trading at $40.76 and the corporate tax rate is 25%. If the return on common stock (return on equity) is 9.9% and the return on preferred stock is 7.6% what is the Weighted Average Cost of Capital (WACC)?