Costco Wholesale Corporation (COST) and Wal-Mart Stores Inc. (WMT) reported the following data (in millions) for a recent year:

1. Compute the return on total assets. Round to one decimal place.
2. Compute the return on stockholders' equity. Round to one decimal place.
3. Compute the profit margin, asset turnover, and financial leverage metrics.
Round profit margin, asset turnover, and financial leverage to two decimal places. Round return on stockholders' equity to one decimal place.
4. Comment on the results of 1, 2, and 3.

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Sales Operating income Average total assets Average stockholders' equity Costco Wal-Mart $116,199 $482,130 15,080 33,232 201,536 11,460 80,970