help!!!

Company A's historical returns for the past 3 years were 6%, 8% and 12%. The market portfolio's returns were 10%, 15%, and 20%. Suppose a risk-free interest rate of return is 3% and that investors expect the market to return 12%. The market value of Company A's equity is $70 million, and the market value of Company A's debt is $30 million. The corporate tax is 35%. The weighted average cost of capital (WACC) for company A is 6.5%. (1) calculate company A's beta (2) calculate company A's cost of capital, computed with the CAPM (3) calculate company A's cost of debt