Costco Wholesale Corporation (COST) and Walmart Stores Inc. (WMT) reported the following data (in millions) for a recent year: Sales Operating income Average total assets Average stockholders' equity Costco Walmart $129,025 $500,343 4,111 20,437 34,755 201,674 11,706 80,679 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. 4. Comment on the results of 1, 2, and 3.