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		 I had a waiter ask me "do you want change?" and my response was "Now that you've asked... Yes!"  I made sure his tip was exactly 15% nothing more. 
 
To answer the original questions, just get your change and leave the tip on the table.  If there's a cashier, either leave your tip before you pay or if you don't have the change wait until you've paid and walk back to the table to leave the tip. 
		
		
		
		
		
			
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				"The truth is merely an excuse for lack of imagination." - Garak
			 
		
		
		
		
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