Presented here is selected information from the 2010 fiscal year 10-K reports of four companies. The four companies, in alphabetical order, are: Advanced Micro Devices, a company that manufactures semiconductors; AT&T, Inc, a large telecommunications company; Deere & Company, a company that manufactures heavy equipment for construction and farming; and Pfizer, Inc, a pharmaceutical company. The data for the companies, presented in the order of the amount of their sales in millions of dollars, are:

Required: 

Based on these financial data and your knowledge and assumptions about the nature of the businesses that the companies operate, determine which data relate to which companies. Write a memorandum explaining your decisions. Include a discussion of which ratios you used in your analysis, and show the computations of these ratios in your memorandum.