i have the answers but i need the breakdown of how to do 11-13 by hand

11) Jack's Construction Co. has 80,000 bonds outstanding that are selling at par value. Bonds with similar characteristics are yielding 8.6 percent. The company also has 4 million shares of common stock outstanding. The stock has a beta of 1.1 and sells for $40 a share. The U.S. Treasury bill is yielding 4 percent and the market risk premium is 8 percent. Jack's tax rate is 34 percent. What is Jack's weighted average cost of capital? 11) A) 11.39% B) 11.47% C) 10.10% D 10.43% E) 10.65% 12) Your estimate of the market risk premium is 7%. The risk-free rate of return is 4% and General Motors has a beta of 1.6. What is General Motors' cost of equity capital? 12) A) 14.4% B) 15.2% C) 16.0% D) 13.7% 13) A firm has a capital structure with $50 million in equity and $100 million of debt. The cost of equity capital is 11% and the pretax cost of debt is 5%. If the marginal tax rate of the firm is 40%, compute the weighted average cost of capital of the firm. 13) A5.67% B) 6.5% C) 4.5%