Please let the customers this tip thing coz one day they will find someone who is is not welling to pay that

On the 30th of march we went the for super but now the food was good, the dessert was not good with Steel things. Worse part is that the workers there they don't even tell people that they tip will be 10% of you are eat, to our suprise they just give you the bill and still don't tell us. We told ourselves that we will give them what we can afford but we end up giving money we didn't budget for it.