A stock has a beta of 1.90 and an expected return of 15 percent. A risk-free asset currently earns 3.6 percent. What is the expected return on a portfolio that is equally invested in the two assets? If a portfolio of the two assets has a beta of 0.95, what are the portfolio weights? If a portfolio of the two assets has an expected return of 7 percent, what is its beta? If a portfolio of the two assets has a beta of 3.80, what are the portfolio weights