please answer with steps...atleast first 2 if all 4 even better

12. Your boss is keen for you to learn more about Airlines. South American Airlines' (SAA) shares are currently trading at $69.25 each. The yield on the company's debt is 4% and the firm's beta is 0.7. The T-Bill rate is 4% and the expected return on the market (E (km)) is 9%. The company's target capital structure is 25% debt and 75% equity. The company pays a combined income tax rate of 35%. The GST rate is 13%. What is SAA's cost of equity? (3 marks) 13. Using the information outlined in #11, calculate SAA's cost of debt (after tax). (3 marks) 14. What is SAA's weighted average cost of capital? (3 marks) a 15. SAA's key rival, Maskati Air has a 7 percent preferred stock outstanding that is currently selling for $48 a share. The preferred stock has a $100 par value. The market rate of return is 10 percent and the firm's tax rate is 34 percent. GST is 13%. What is Maskati's cost of preferred stock