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I took an Uber black car to the airport a couple days ago and there was not any UI for tipping. I looked to see if I could add in a tip; it's a flat fee for the ride. How can they take 50% of something that doesn't exist?

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>20% of the metered fare will be automatically added and paid to the driver as a gratuity.

http://support.uber.com/entries/22338858-Tipping-Drivers

That's talking about calling taxis (i.e. yellow cabs). kevingadd said he took a black car, not a taxi.

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