The second tab at the bottom of the screen allows you to calculate margins.

This option is designed to set the price of items according to their cost and the desired margin.

First, one must introduce the Cost of the article.
Then the will be placed Margin what is desired to obtain from the sale.
The margin can be a nominal value or a percentage on the cost of the product.

Once the margin has been added, the same software will propose the price selling price. This, like the margin, can be modified to adjust the item's price according to the desired margins.

As purchases are made, the cost of the items will be updated.