Historical Returns: Expected and Required Rates of Return You have observed the following returns over time: Assume that the risk-free rate is 5% and the market risk premium is 4%. 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. Stock X: \% Stock Y : \% 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 caiculations. Round your. answer to two decimal places