15. You own a portfolio that is invested 43 percent in Stock A, 16 percent in Stock B, and the remainder in Stock C. The expected returns on stocks A, B, and C are 9.1 percent, 16.7 percent, and 11.4 percent, respectively. What is the expected return on the portfolio?

16. Bama Entertainment has common stock with a beta of 1.22. The market risk premium is 8.1 percent and the risk-free rate is 3.6 percent. What is the expected return on this stock?

17. Ben & Terry's has an expected return of 13.2 percent and a beta of 1.08. The expected return on the market is 12.6 percent. What is the risk-free rate?