It has been my experience that you pay for your service. If it's average service by all means give the 15%. If it's better give more. If it's worse give less and if it's real bad give them nothing.
When giving money you should always expect change unless you tell them to keep the change. It should never be assumed that you mean for them to keep it.
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...because there are no facts, there is no truth, just data to be manipulated. I can get you any results you like, what's it worth to you.....
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