Ferris Ltd. of Australia has two divisions, one in Perth and one in Darwin. Selected data on the two divisions follow: Division Perth Darwin Sales $9,000,000 $20,000,000 Operating income 630,000 1,800,000 Average operating assets 3,000,000 10,000,000 Required: 1. Compute the ROI for each division. 2. Assume that the company evaluates performance using residual income and that the minimum required rate of return for any division is 16%. Compute the residual income for each division. 3. Is the Darwin Division's greater residual income an indication that it is better managed? Explain