Suppose selected comparative statement data for the giant bookseller Barnes & Noble are presented here. All balance sheet data are as of the end of the fiscal year (in millions). Net sales Cost of goods sold Net income Accounts receivable Inventory Total assets Total common stockholders' equity 2020 $5,000 3,300 75 75 1,225 3,170 857 2019 $5,800 3,513 134 106 1,390 3,080 1,122 Compute the following ratios for 2020. (Round asset turnover to 2 decimal places, e.g. 1.67. Round all other answers to 1 decimal place, e.g. 1.6 or 1.6%.) (a) Profit margin (b) Asset turnover times (c) Return on assets (d) Return on common stockholders' equity (ea) Gross profit rate