Sella's and Tip Trauma

Does anyone know what the percentage of the food cost is added to come up with the amount of the final bill with service included? That would be good to know to determine if any further tip should be paid.
 
Here's what the tourism office had to say about service compris in their letter chastising the establishments that were asking for tips:

As a reminder, in Metropolitan France, prices include taxes and service and include the service (about


15% of the total price). If the service has been particularly neat, the customer can tip for


Show his satisfaction.
 
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