It depends on the amount of people at a table in some is after 6 I think the% is charged for waiter service.
This is something that more than one person asks. The service that the waiters normally give in this restaurant is not very good and I suppose it is the only way they have to make sure to receive a tip. The hot possibility is that the system they use in the billing box automatically adds the tip to Invoices based on a percentage.
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