Return on Investment and Residual Income The company's desired rate of return is 10%. Income is defined as operating income. a. What are the respective return-on-investment ratios for the North and South divisions? Round ROI to the nearest whole percentage. b. What are the respective residual incomes of the North and South divisions? c. Which division has the better return on investment and which division has the better residual income figure? Return on investment Residual income