XYZ Fried Chicken is trying to determine its WACC at the optimal capital structure. The firm now has only debt and equity, and estimates that it will continue to use only debt and equity in the future also. It has determined that the optimal capital structure is given by a debt-to-equity ratio of 0.5. At this ratio, its pre-tax cost of debt is 6%. It has estimated that if it had no debt, then its beta would be 1.2. Assume the risk-free rate is 2% and the market risk premium is 8%. Assume the firm? s tax rate is 40%. Based on this information, what is the WACC at the optimal capital structure?