Return on investment The operating income and the amount of invested assets in each division of Conley Industries are as follows: Operating Income Invested Assets Retail Division $9,600,000 $40,000,000 Commercial Division 12,100,000 55,000,000 Internet Division 6,480,000 36,000,000 a. Compute the return on investment for each division. Division Percent Retail Division % Commercial Division % Internet Division % b. Which division is the most profitable per dollar invested