Costco Wholesale Corporation (COST) and Wal-Mart Stores Inc. (WMT) compete against each other in general merchandise retailing, gas stations, pharmacies, and optical centers. Below is selected financial information for both companies from a recent year's financial statements (in millions):

a. Determine for both companies (1) the inventory turnover and (2) the days' sales in inventory. Round to one decimal place.
b. Compare and interpret the inventory metrics computed in (a).

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Costco Wal-Mart Sales Cost of goods sold Inventory, beginning of period Inventory, end of period $116,199 101,065 $485,651 365,086 44,858 45,141 8,456 8,908