Panther Corporation has a cost of debt of 8%. The risk-free rate of interest is 3% and the expected return on the market portfolio is 10%. If the firm has a beta of 0.65 and an effective tax rate of 30% with a capital structure that is 40% debt and 60% equity, what is the firm's weighted average cost of capital? 7.82% 6.77% 7.40% 7.19%