Compute six ratios that measure McKnight Corporation's ability to earn profits. The company's comparative income statement follows. The data for 2015 are given as needed. (Click the icon to view the comparative income statement.) Did the company's operating performance improve or deteriorate during 2017? Income statement For the Years Ended December 31, 2017 and 2016 (amounts in thousands) 2017 2016 Sales revenues Less: Cost of goods sold Gross profit Less: Operating expenses Operating income Less: Interest expense Income before income taxes Less: Income tax expense Net income McKnight Corporation Income Statement Additional data: Total assets Common stockholders' equity $ $ $ $ $ SA 164,000 $ 85,000 79,000 $ 36,000 43,000 $ 10,500 32,500 $ 15,936 16,564 $ 205,000 $ 96,000 $ 180,080 80,000 100,080 15,000 85,080 11,500 73,580 62,325 11,255 193,000 $ 88,000 $ 2015 177,000 67,000 I Profitability ratios a. Gross profit percentage b. Operating income percentage c. Rate of return on net sales d. Rate of return on total assets e. Rate of return on common stockholders' equity f. Earnings per share of common stock