The Central Division of National Inc. has operating income of $16,900 on sales revenue of $158,000. Divisional operating assets are $82,700, and management of National has determined that a minimum return of 12% should be expected from all 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