Required: 1. Calculate return on investment (ROI) and residual income for each division for last year. 2. Recalculate ROI and residual income for each division for each independent situation that follows: c. Operating income increases by 10 percent. d. Operating income decreases by 10 percent. e. The company invests $250,000 in each division, an amount that generates $100,000 additional income per division. f. Coolbrook changes its hurdle rate to 10 percent