The book examples are really bad. Please help me with these two parts

Provide the missing data in the following table for a distributor of martial arts products: (Round "Turnover" and "ROI" answers to 1 decimal place.) Division Alpha Bravo Charlie Sales $ 322,500 $ 45,150 $ 54,080 Net operating income Average operating assets Margin $ 482,000 7% 13 % Turnover 5.0 Return on investment (ROI) % 35.0 % 26.0 % Comparative data on three companies in the same service industry are given below: Required: 2. Fill in the missing information. (Round the "Turnover" and "ROI" answers to 2 decimal places.) Company B C Sales $ 3,444,000 585,480 $ 1,640,000 1,285,000 231,300 Net operating income Average operating assets Margin $ $ 2,690,000 % % 7 % Turnover 2.00 Return on investment (ROI) % 9.00% %