(7-20) Leturns: ted and id Rates [Return You have observed the following returns over time: Year Stock X Stock Y Market 2017 14% 13% 1246 2018 19 7 10 2019 -16 -5 -12 2020 3 1 1 2021 20 11 15 Assume that the risk-free rate is 3%, the market risk premium is 6%, the beta for Stock X is 1.50, and the beta for Stock Y is 0.46. a. What are the required rates of return for Stocks X and Y? b. What is the required rate of return for a portfolio consisting of 80% of Stock X and 20% of Stock Y? c. If Stock X's expected return is 13%, is Stock X under- or overvalued?