7-20. Historical Returns: Expected and Required Rates of Return You have observed the following returns over time: Year 2011 2012 2013 2014 2015 Stock X Stock Y Market 14% 13% 12% 19 7 10 - 16 -5 -12 3 s11 20 11 15 - Assume that the risk-free rate is 4%, the market risk premium is 5%, 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 40% of Stock X and 60% of Stock Y? c. If Stock X's expected return is 13%, is Stock X under-or over-valued