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In order to "save you from etiquette failure" while attempting to tip in foreign countries, here's a newish website that helpfully calculates how much to tip based on local customs. Tip This Much In... features the tipping customs of more than 60 countries, from Latvia (where five to 10 percent is average) to North Korea (where leaving a tip, even for exceptional service, is "uncommon"). [TipThisMuch]