Please answer a,b and c

P 5-2 Best Buy Co., Inc.'s consolidated statements of earnings from its 2011 annual report are presented in Exhibit 5-3. Required Using the statement of earnings, prepare a vertical common-size analysis for 2011, 2010, and 2009. Use revenue as a base. Using the statement of earnings, prepare a horizontal common-size analysis for 2011 2010, and 2009. Use 2009 as the base. a. b. c. Comment on significant trends that appear in () and (b)