12. In a world of one risk-free and one risky asset, and investor faces the following values for expected return on the risky portfolio, SD of the risky portfolio and risk-free rate. In what follows adopt the notation that y= fraction of the complete portfolio in the risky portfolio E(rc)= return on the complete portfolio Se=SD of the complete portfolio a. What does the complete portfolio look like for the investor who says, "I won't accept more than Se=10% (SD in my complete portfolio)?" What is y? Show your work. What is E(rc) ? Show your work b. What does the complete portfolio look like for the investor who says, "I want to achieve a 15% expected return, at minimum risk of course." What is y ? Show your work What is Se ? Show your work. What is Se ? Show your work. c. What is the Sharpe Ratio for the two portfolios in parts (a) and (b)