Download three years of historical daily prices for Microsoft (MSFT) and the S&P 500 from Yahoo Finance. Do the following: a. Compute the daily rates of return b. Compute the average rates of return and risk of portfolios that combine MSFT and the S&P 500 in the following portfolios: (0.0, 1.0) to (1.0, 0.0) in increments of 5% points. Plot the portfolios against one another. c. Compute the beta for MSFT.