Dumble Doors and Portals (DDP) has two divisions that operate independently of one another. Financial data for the most recent year follows below. Sales Albus $3,000,000 750,000 6,000,000 Aberforth $2,500,000 505,000 5,000,000 Operating income Operating assets The company's required rate of return is 10%. 1. Calculate each division's return on investment (ROI) and residual income, 2. Independent of the performance of division managers, provide 2 reasons why the Albus division's ROI is inherently different from that of Aberforth