Exercise 12-1 Compute the Return on Investment (ROI) [L012-1] Tundra 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: $18,000,000 Sales Net operating income S 5,400,000 Average operating assets $36,000,000 Required 1. Compute the margin for Tundra Services Company. Maran 2. Compute the turnover for Tundra Services Company. (Round your answer to 1 decimal place.) ITUmower 3. Compute the return on investment (ROI for Tundra Services Company. (Do not round intermediate calculations.)