A family friend has asked your help in analyzing the operations of three anonymous companies operating in the same service sector industry. Supply the missing data in the table below: \begin{tabular}{|c|c|c|c|} \hline & Company A & Company B & Company C \\ \hline Sales. & $240,000 & $3,240,000 & $1,920,000 \\ \hline Operating income. & $25,200 & & $35,200 \\ \hline Average capital assets & & $360,000 & \\ \hline Return on investment (ROI). & 21% & 5% & \\ \hline \multicolumn{4}{|l|}{ Minimum required rate of return: } \\ \hline Percentage.... & 25% & & 12% \\ \hline Dollar amount.... & & $32,400 & \\ \hline Residual income. & & & ($3,200) \\ \hline \end{tabular}