Exercise 10-20 Presented below is selected information for three regional divisions of Medina Com pany. North $300,800 $141,000 000 West $499,900 359,700 South $400,300 $210,300 Contribution margin Controllable margin Average operating $1,635,000 $1,402,000 $940, assets 14 % 10% Minimum rate of return 11 % Compute the return on investment for each division. (Round ROI to 0 decimal places, e.g. 15.) North Division West Division South Division Compute the residual income for each division. (Round final answers to 0 decimal places, e.g. 1,255.) North Division West Division South Division Assume that each division has an investment opportunity that would provide a rate of return of 16%. If ROI is used to measure performance, which division or divisions will probably make the additional investment? (2) If residual income is used to measure performance, which division or divisions will probably make the additional investment