Presented below is selected information for three regional divisions of Medina Company. Divisions South West North $300,000$499,700 $399,500 Contribution margin $140,000 $360,000 $210,000 Controllable margin Average operating assets $1,000,000 $1,440,000 $1,500,000 14 % 8% -13 % Minimum rate of return Compute the return on investment for each division. 14 | 96 North Division 19 | 96 West Division South Division 14 | % Compute the residual income for each division 10000 North Division $ West Division $ 40000 60000 South Division $