The document discusses the concept of net profit margin and how it is calculated. It provides an example calculation where a company had $350,000 in sales, $192,500 in cost of goods sold, $105,000 in other expenses, and $52,500 in net profit. This results in a net profit margin of 15% ($52,500/$350,000). The document then discusses how a company can improve its net profit margin by either increasing gross profit or decreasing other expenses.