If you are in a trading company, most of them are calculated by profit, but the problem is that many trading companies don't disclose the cost to you, so you can't know how much profit there is. In that case, you can only let others give it to you.
As can be seen from the above, whether in a factory or a trading company, the commission of a foreign trade salesman is hard to say. Only do SOHO yourself and find your own customers and suppliers, except for the cost and other expenses.