Liz Raiborn Inc. has the following financial results for the years 2019 through 2021 for its three regional divisions: 2019 2020 2021 Revenue Southwest $ 14,500 $ 21,600 $ 25,600 Midwest 6,300 6,600 6,800 Southeast 12,000 12,600 12,900 Total $ 32,800 $ 40,800 $ 45,300 Net Operating Income Southwest $ 700 $ 800 $ 950 Midwest 850 1,200 1,150 Southeast 600 800 1,200 Total $ 2,150 $ 2,800 $ 3,300 Average Total Assets Southwest $ 13,600 $ 13,800 $ 16,400 Midwest 4,300 3,800 3,800 Southeast 4,900 5,200 5,200 Total $ 22,800 $ 22,800 $ 25,400 Required: Calculate return on sales (ROS), asset turnover (AT), and return on investment (ROI) for each division and also for the firm as a whole for each of the three years 2019, 2020, and 2021. (Note: Due to rounding your percentages, the totals for the firm might not be the actual total of the individual divisions.)