Coolbrook Company has the following information available for the past year: Sales revenue Cost of goods sold and operating expenses Net operating income Average invested assets. River Division $1,200,000 900,000 Stream Division $1,800,000 1,300,000 $ 300,000 $ 500,000 $1,200,000 $1,800,000 The company's hurdle rate is 6 percent. 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: a. Operating income increases by 10 percent. b. Operating income decreases by 10 percent. c. The company invests $250,000 in each division, an amount that generates $100,000 additional income per division. d. Coolbrook changes its hurdle rate to 10 percent.