The Uber Technologies Inc. application runs on an Apple Inc. iPhone during an Uber ride in Washington, D.C., U.S., on Wednesday, April 8, 2015. Last month, Uber accounted for 47 percent of all rides expensed by employees whose companies use Certify, the second-largest provider of travel and expense management software in North America. In March 2014, Uber accounted for only 15 percent, according to a study by Certify released on April 7. Photographer: Andrew Harrer/Bloomberg via Getty Images
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