Historical Returns: Expected and Required Rates of Return You have observed the f Assume that the risk-free rate is 7% and the market risk premium 15 J.o. a. What are the betas of Stocks X and Y ? Do not round intermediate calculations. Round your answers to two decimal places. Stock : Stock Y: b. What are the required rates of return on Stocks X and Y ? Do not round intermediate calculations. Round your answers to two decimal places. Stock X:% Stock Y: % :. What is the required rate of return on a portfolio consisting of 80% of Stock X and 20% of S tock Y ? Do not round intermediate calculations. Round your answer to two decimal places. %