(6-13) You have observed the following returns over time: storical Relums: Expected and quilred Rates of Return Assume that the risk-free rate is 6% and the market risk premium is 5%. a. What are the betas of Stocks X and Y ? b. What are the required rates of return on Stocks X and Y ? c. What is the required rate of return on a portfolio consisting of 80% of Stock X and 20% of Stock Y? d. If Stock X's expected return is 22%, is Stock X under- or overvalued