Calculate and explain the differences of at least three profitability ratios, such as gross profit margin, net profit margin, return on assets, or operating profit margin

Locate the income statement of three companies in different industries, such as an airline, discount retailer, restaurant, auto manufacturer, etc. Calculate at least three profitability ratios for each company, such as gross profit margin, net profit margin, return on assets, or operating profit margin. Discuss the differences you find between industries and why you think those differences exist.