The Central Division of National, Inc., has operating income of $19,000 on sales revenue of $185,000. Divisional operating assets are $84,100, and management of National has determined that a minimum return of 11% should be expected from ali investments. Required: a. Using the DuPont model, calculate The Central Division's margin, turnover, and ROI. (Do not round intermediate calculations. Round your answers to 2 decimal places.) Central Division Margin Turnover ROI turns b. Calculate The Central Division's residual income Residual income