Suppose risk-free rate is 6% and the expected return of the risky portfolio is 12% with 0.25 standard deviation. Your complete portfolio has 0.05 as the return variance. What is the risk premium of your complete portfolio? (Equation 5.20)

You sell short 18 shares of Wells Fargo &Co that are currently selling at $54 per share. You post the 0.56 margin required on the short sale. If your broker requires a 0.37 maintenance margin (MMR), at what stock price will you get a margin call? (You earn no interest on the funds in your margin account, and the firm does not pay any dividends.)