4. Currently, Millat Inc. has a capital structure consisting of 20% debt and 80% equity. Millat's debt currently has an 10% yield to maturity. The risk-free rate (TRF) is 5%, and the market risk premium (rM TRF) is 6%. Using the CAPM, Millat estimates that its cost of equity is currently 12.5%. The company has a 40% tax rate. (6 marks) a) What is Millat's current WACC? b) What is the current beta on Millat's common stock? c) What would Millat's beta be if the company had no debt in its capital structure