Missing information?What formulas do I use?

3 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 A B C Sales $ 4, 161,000 $ 1,008,000 Net operating income $ 457,710 5 110,880 Average operating assets $ 2,190,000 $ 3,490,000 Margin % % 4% Turnover 2.00 Return on investment (ROI) % 4.40 % %