According to the rest of the world, Americans (more specifically, New Yorkers) are the most generous tippers out there.
But even within the U.S., tipping etiquette changes in just about every region. It may be customary to leave an extra 20% for your waiter in Manhattan, but a waiter in Atlanta may be thrilled to get 15%.
To help, here's a complete guide to gratuity etiquette, courtesy of Mint.com. Brush up on your math and the next time you hire a mover or order room service, you and your wallet will be prepared.
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