Presented below is selected information for three regional divisions of Medina Company. Divisions North West South Contribution margin $299,900 $500,000 $399,900 Controllable margin $141,000 $360,000 $210,000 Average operating assets $940,000 $1,800,000 $1,400,000 Minimum rate of return 11 % 14 % 9% x Your answer is incorrect. Assume that each division has an investment opportunity that would provide a rate of return of 16%. North South If ROI is used to measure performance, which division or divisions will probably make the additional investment West North and South North and West South and West North, South and West If residual income is used to measure performance, which division or divisions will probably make the additional summ