For its three investment centers, Riverbed Company accumulates the following data: Sales $2,120,000 $4,240,000 $4,240,000 Controllable margin 1,537,000 2,204,800 3,922,000 Average operating assets 5,300,000 8,480,000 10,600,000 | Compute the return on investment (ROI) for each center. The return on investment % II % do III = do %