You have observed the following returns over time:
Year		Stock X		Stock Y		Market
2009		14%		13%		12%
2010		19		7		10
2011		-16		-5		-12
2012		3		1		1
2013		20		11		15
Assume that the risk-free rate is 6% and the market risk premium is 5%.
a. What are the betas of Stock X and Y?
b. What are the required rates of return on Stocks X and Y?
c. What is the required rate of return on portfolio consisting of 80% of Stock X and 20% of Stock Y?

Thank you very much for your help!