you are considering an investment in either individual stocks or a portfolio of stocks. The two stocks you are researching, Stocks A and B have the following historical returns

Year	Ra	Rb
2008	-20	-5
2009	42	15
2010	20	-13
2011	-8	50
2012	25	12

Suppose you had held a portfolio consisting of 50% of stock A and 50% of Stock B. What would have been the realized rate of return on the portfolio in each year? What would have been the average return on the portfolio during this period