How much you tip depends on the service, which can really put your math skills to the test!

你给多少小费取决于服务的质量，这将是对数学技能的考验！

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You're out to dinner.The food was delicious and the service was fine.You decide to leave a big fat tip - why?

当你在外面吃饭的时候，食物可口，服务周到，于是你决定留下一笔丰盛的小费——这是为什麽呢？

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Even if service is substandard still leave at least some tip.

即使服务是不合格的，也要记得给一些小费。

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The company says it hasn't yet turned a profit, CEO Eric Liu said, but he hopes police departments that currently get its service for free will later sign up for paid premium services and upgrades, such as a secured anonymous tip service through the Web.

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Why would I leave a big tip on clearly lackluster service?

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