Kathy : It is quite simple. If you think the server was helpful and there were no problems with the food. you leave the tip on the table. 10 to 15% of the bill is a reasonable amount.
Greg : But, I heard that tip were originally optional and given to reward exceptional service. Do I always have to leave a tip?
Kathy : Yeah, unless the serive was extermely terrible. In many cases, serive workers including waiters rely on tips for their earnings.
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