The following information is taken from the financial statements of Down Home Deli for the last three years. The owner, John Walton is quite pleased to see that his sales are growing steadily. Sales Cost of goods sold Operating income Net income Instructions: 2018 2017 2016 $ 61,500 $50,400 $ 42,000 27,670 21,170 16,800 7,530 6,050 4,620 3,075 4,030 2,940 (a) Calculate gross profit margin, profit margin, and profit margin using operating income. (b) Comment on whether the Deli is, in fact, doing better over the three years as John believes