A stock has a beta of 0.9 and an expected return of 9 percent. A risk-free asset currently ears 4 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 0.5, what are the portfolio weights?

c. If the portfolio of the two assets has an expected return of 8 percent, what is its beta?

d. If a portfolio of the two assets has a beta of 1.80, what are the portfolio weights? How would you interpret the weights for the two assets in this case? Explain