Can anybody help?

Question 5 1 pts Kokapeli, Inc. has a target capital structure of 40% debt and 60% common equity, and has a 21% marginal tax rate. If the firm's yield to maturity on bonds is 5.5% and investors require a 13% return on the firm's common stock, what is the firm's weighted average cost of capital? 7.20% 9.54% 9.89% 8.25%