The system helps you figure out the profit margin on tasks and sales, so you always know what you earn/have earned on each tasks/sales.
This is how you see the profit margin on Tickets:
Click on Tickets
Click on the ticket you want to see the profit on
Then you press Show profit margin in the upper right corner of the Inventory column
Here you can see the added items, the Price of that item, the Quantity, the total price of the ticket, the Cost price and the Profit margin on this particular ticket.
You can always add extra items by pressing +Add product or by using the products/items barcode.