Gamma Corp. has a debt-to-equity ratio of 1.5 . Its current WACC is 11%. The corporate tax rate is 35%. The covariance of its return of debt with the market is 0.05 , the variance of market return is 0.25 , the market risk premium is 0.1 , and the risk-free rate of return is 5%. a) What is the company's current cost of debt? b) What is the company's cost of equity? And what is the company's equity beta? c) What is the company's unlevered (all-equity) cost of equity? d) What would the company's cost of equity be if the debt-to-equity ratio is 2,1 , and 0