eMAG commissions range between 14% and 24%.
You can find them in the contract with eMAG. Whenever new categories are opened, they send a new contract where the commission percentage for each category is listed.
Navigate to: My account - Legal documents (column Document type - Commissions).
Commissions are also always listed in the invoice, where the commission amount is shown for each sold item, both in monetary value and percentage.
Navigate to: Financial - Detailed reports - Commission.