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 $88,200 $490,000 Commercial Division 123,900 590,000 Internet Division 57,200 440,000 a. Compute the return on investment for each division. (Round to the nearest whole percentage.) Division Percent Retail Division % Commercial Division % Internet Division % b. Which division the most profitable per dollar invested