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For its three investment centers, Vaughn Company accumulates the following data: I II III Sales $1,941,000 $4,018,000 $3,956,000 Controllable margin 884,340 2,065,180 4,850,800 Average operating assets 4,913,000 7,943,000 12,127,000 Compute the return on investment (ROI) for each center.