You have observed the following returns over time: Assume that the risk-free rate is 6 percent and the market risk premium is 5 percent. a. What are the betas of Stocks X and Y? b. What are the required rates of return for Stocks X and Y? c. What is the required rate of return for a portfolio consisting of 80 percent of Stock X and 20 percent of Stock Y? d. If Stock X’s expected return is 22 percent, is Stock X under- or overvalued?