Brief Exercise 10-9 For its three investment centers, Gerrard Company accumulates the following data: III Sales Controllable margin Average operating assets $1,900,000 1,165,870 5,069,000 II $3,912,000 1,840,690 8,003,000 $4,018,000 3,743,250 12,075,000 Compute the return on investment (ROI) for each center. II III The return on investment