Oxy Corporation uses debt, preferred stock and common stock to raise capital. The firm's capital structure the following properties debt 54%, preferred stock 12%, and common stock, 34%. If the cost of debt is 6.3%, preferred stock costs 8.1%, and common stock costs 11.3%, what is Oxy's weighted average cost tf capital (WACC)? Oxy's weighted average cost of capital (WACC) is %