Presented below is selected information for three regional divisions of Medina Company. Divisions North West South $300,600 $139,500 $499,300 $360,800 $399,100 $210,000 Contribution margin Controllable margin Average operating assets Minimum rate of return $930,000 $1,640,000 $1,400,000 13 % 14 % 8 % (a) Your answer is correct. Compute the return on investment for each division. North Division 15% West Division 221 % South Division 15 % Compute the residual income for each division. North Division $ West Division $ South Division $