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 $138,600 $660,000 Commercial Division 141,600 590,000 Internet Division 47,600 280,000 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 is the most profitable per dollar invested? Commercial Division Internet Division Retail Division