You have observed the following returns over time: Assume that the risk-free rate is 5% and the market risk premium is 3%. a. What are the betas of Stocks X and Y ? Do not round intermediate calculations. Round your answers to two decimal places. Stock X : 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. c. What is the required rate of return on a portfolio consisting of 80% of Stock X and 20% of Stock Y ? Do not round intermediate calculations. Round your answer to t decimal places. %