Using Inventory Analysis Tools AutoZone and O'Reilly are two competitors in the retail automotive parts industry. a. Use the information above to compute the companies' gross profit margin and days inventory outstanding for both years. b. Based on these two ratios, which company is more profitable selling its inventory? How has that changed from 2017 to 2018 ? c. Based on these two ratios, which company is more efficient with its inventory? How has that changed from 2017 to 2018