Following returns observed over the time assumes risk free rate is 6% and the market risk premium is 5%.What are the betas of stock X and Y.What is the required rates of return for stock X and Y.What is the required rate of return for portfolio consisting of 80% of stock X and 20% of stock Y.If stock X's expected return is 22%,is stock X under or over-valued. How is beta calculated.What formula is used to calculate beta in this problem?