D. 62.5% 4. If the South Australian Division of Australian Products Limited had a turnover ratio of 4.2 and a margin of 0.10, the return on investment would be: 23.8% 420.0% 42.0% 238.0% If the margin of 0.3 stayed the same and the turnover ratio of 5.0 increased by 10%, the ROI would: increase by 10% decrease by 10% increase by 15% D. remain the same 6. If the operating asset turnover increased by 50% and the margin increased by 50%, the ROI would increase by