On the Profit section of the Reports tab you can see the evolution of gross profit for the selected period, i.e. the difference between sales and cost of raw materials according to your stock data. You can also find the benefit margin here.
If you manage multiple businesses you can choose what data you want to display on the top-left menu (1). You can also set a specific time period (2), you can also export your data from both the chart and the table (3), the export is generated in .xls format for Excel. The charts on the Profit section work like the charts in most other sections in the Reports tab, and you can learn how to work with them on this article.
The table shows you gain, margin, taking and costs. You can also select the types of payments you want to see on the chart using the checkboxes (4).