Final answer:
To determine which division performed the worst using the ROI measure, calculate the ROI for each division and compare. The West Division has the lowest ROI.
Step-by-step explanation:
To determine which division performed the worst using the return on investment (ROI) measure, we need to calculate the ROI for each division. ROI is calculated by dividing the after-tax income by the divisional assets and multiplying by 100.
The ROI for the South Division is ($20,000 / $200,000) * 100 = 10%.
The ROI for the West Division is ($50,000 / $625,000) * 100 = 8%.
The ROI for the East Division is ($100,000 / $800,000) * 100 = 12.5%.
Therefore, the division that performed the worst using the ROI measure is the West Division, with an ROI of 8%.