can anybody solve this?

16. Using CAPM A stock has a beta of 1.08 and an expected return of 11.6 percent. A risk-free asset x currently earns 3.6 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 50, what are the portfolio weights? c. If a portfolio of the two assets has an expected return of 10.5 percent, what is its beta? d. If a portfolio of the two assets has a beta of 2.16, what are the portfolio weights? How do you interpret the weights for the two assets in this case? Explain