TT Services Company, a division of a major oil company, provides various services to the operators of the North Slope oil field in Alaska. Data concerning the most recent year appear below: Sales $ 17,700,000 Net operating income $ 5,100,000 Average operating assets $ 35,100,000 Required: 1. Compute the margin for TT Services Company. (Round your answer to 2 decimal places.) 2. Compute the turnover for TT Services Company. (Round your answer to 2 decimal places.) 3. Compute the return on investment (ROI) for TT Services Company. (Round your intermediate calculations and final answer to 2 decimal places.)