The following selected information is for Ceradyne Corporation: 2020 Total assets Total shareholders' equity Sales Cost of goods sold Net income 2021 $359,000 132,500 501,000 365,229 32,565 $285,000 101,500 393,000 291,999 30,654 2019 $275,000 53,000 288,000 188,000 20,400 Ceradyne had no preferred shares. (a) Calculate the gross profit margin, profit margin, asset turnover, return on assets, and return on common shareholders' equity ratios for 2021 and 2020. (Round gross profit margin, profit margin, return on assets and return on equity to 1 decimal place e.g. 2.6. Round asset turnover to 2 decimal places e.g. 6.21.) 2021 2020 Gross profit margin % % Profit margin % % Asset turnover times times Return on assets % % Return on common shareholders' equity % %