You are evaluating various investment opportunities currently available and you have the following information about five different well-diversified portfolios of risky assets. Interest rate rf=4%. Total: 25 marks. Answer the following questions: (a) Calculate the Sharpe ratio for each portfolio. (10 marks) (b) Explain which of these five portfolios is most likely to be the optimal risky portfolio. (5 marks) (c) Suppose you are willing to invest with =18.2%. What would be the investment proportions in the riskless asset and the optimal risky portfolio? What is the expected return for this investment? (10 marks)