Sound controls mitigate the risks associated with EDI. The question states that the internal auditing department's prior involvement consisted of assessing and testing the EDI system. This review found no significant problems. Accordingly, the risk of the EDI system is decreased.

The profit margin equals the profit available to ordinary shareholders divided by sales, the total assets turnover equals sales divided by total assets, and the product of these two ratios is the return on assets. This result is the basic Du Pont equation. In the extended Du Pont equation, the return on assets is multiplied by the leverage factor, also called the equity multiplier total assets + ordinary equity at carrying amount). The extended Du Pont equation gives the return on ordinary equity. This result is obtained because the total assets and sales factors cancel in the multiplication of the three ratios.

The primary business application of differential calculus is to identify the maxima or minima of curvilinear functions. In business and economics, these are the points of revenue or profit maximization (maxima) or cost minimization (minima). The EOQ results from differentiating the total cost with regard to order quantity.