13.1 Using the spreadsheet below, calculate: a. Total returns for the S\&P 500 for each year from 1991 through 2010 b. Cumulative wealth for the first 10 years (1991-2000) and for the second 10 years (2001-2010) c. The P/E ratio for all 20 years d. The dividend yield for each year, using the dividend in the current year and the price at the end of the previous year (e.g., 2010 would be calculated as the 2010 dividend divided by the ending price for 2009)