Alpha Corp. is financed 30% with debt, 10% with preferred stock, and 60% with common stock. Its pretax cost of debt is 6%, its preferred stock pays an annual dividend of 2.50 and is priced at $30. It has an equity beta of 1.1. Assume the risk-free rate is 2%,the market risk premium is 7% and Alpha's tax rate is 40%. What is its after-tax WACC?