Brief Exercise 24-9 For its three investment centers, Gerrard Company accumulates the following data: I II III Sales $1,963,000 $3,992,000 $4,097,000 Controllable margin 1,031,940 2,509,140 4,810,800 Average operating assets 4,914,000 8,094,000 12,027,000 Compute the return on investment (ROI) for each center. I II III The return on investment % % %