Price
	MSFT	IBM	S&P500
2008	19.44	84.16	903.25
2009	30.48	130.9	1115.1
2010	27.91	146.76	1257.64
2011	25.96	183.88	1257.6
2012	26.71	191.55	1426.19
2013	37.41	187.57	1848.36
2014	46.45	160.44	2058.9

1. What is the return for each year for each stock and the S&P500? (What formula do I use in excel?

2. What is the average return over the period for each stock and the S&P500?

3. What is the standard deviation for MSFT and IBM? Which stock is the riskiest?

4. What is the beta of MSFT and IBM?

(Need help figuring out how to calculate all of this in Excel)