A stock has a beta of 1.31 and an expected return of 12.9 percent. A risk-free asset currently earns 4.35 percent. A. What is the expected return on a portfolio that is equally invested in the two assets? B. If a portfolio of the two assets has a beta of .91, what are the portfolio weights? C. If a portfolio of the two assets has an expected return of 12.1 percent, what is its beta? D. If a portfolio of the two assets has a beta of 2.51, what are the portfolio weights?