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Tipping is a common practice in most parts of the world. After all, service employees are generally not that well paid, and most appreciate the small token of gratitude for their care. Americans go as far as to tip 20% (it is, believe it or not, their standard!), while us Europeans will generally leave a few extra Euros or pounds in cash, or simply give the change back to the employee.
from: http://ezinearticles.com/?How-To-Tip-In-Venice&id=6996877
