I would like help answer this question the subject is shipping finance

GreenHouse Ltd. is financed exclusively by equity and has a beta of 1.2. The firm is expected to generate a level, perpetual stream of earnings and dividends. The company's stock is selling for $30. Now the company decides to repurchase half of its shares and substitute an equal amount of equity with debt. The debt is risk-free with 4.0% interest rate. The market risk premium is 8.0%. The company is exempted from taxes. a) Assuming CAPM is correct; calculate the cost of equity before the refinancing. b) Assuming MM is correct; calculate the cost of equity after the refinancing. c) Assuming MM is correct; calculate the overall cost of capital (WACC) after the refinancing d) Assuming MM is correct; calculate the stock price after the refinancing. e) Assuming MM is correct; calculate the stock's beta after the change in capital structure. f) Explain why the stock beta after the refinancing is similar to or different from 1.2. GreenHouse Ltd. is financed exclusively by equity and has a beta of 1.2. The firm is expected to generate a level, perpetual stream of earnings and dividends. The company's stock is selling for $30. Now the company decides to repurchase half of its shares and substitute an equal amount of equity with debt. The debt is risk-free with 4.0% interest rate. The market risk premium is 8.0%. The company is exempted from taxes. a) Assuming CAPM is correct; calculate the cost of equity before the refinancing. b) Assuming MM is correct; calculate the cost of equity after the refinancing. c) Assuming MM is correct; calculate the overall cost of capital (WACC) after the refinancing d) Assuming MM is correct; calculate the stock price after the refinancing. e) Assuming MM is correct; calculate the stock's beta after the change in capital structure. f) Explain why the stock beta after the refinancing is similar to or different from 1.2