Calculate values for the following: a. Gross profits b. Cost of goods sold c. Operating profits d. Operating expenses e. Earnings available for common stockholders f. Total assets g. Total common stock equity h. Accounts receivable \begin{tabular}{lc} \hline \multicolumn{1}{c}{McDougalPrinting,Inc.YearEndedDecember31,2019} \\ \hline Sales & $50,000,000 \\ Gross profit margin & 79% \\ Operating profit margin & 39% \\ Net profit margin & 6% \\ Return on total assets & 10.8% \\ Return on common equity & 19% \\ Total asset turnover & 1.8 \\ Average collection period & 62.9 days \end{tabular}