Below is selected data about Alpha, Inc. and relevant market information:

Beta of common stock 1.5

Treasury bond rate 1%

Required total return on market portfolio (Rm) 7%

Yield to maturity on long-term debt 6.0%

Book value of equity $500 million

Market value of equity $900 million

Long-term debt outstanding $600 million

Corporate tax rate 25%

What is the companys cost of equity, Alpha's after-tax cost of debt, and Alpha's Weighted Average Cost of Capital?