By Shu Zhang and Gerry Shih BEIJING (Reuters) - Uber Technologies Inc's [UBER.UL] global bookings are projected to rise nearly threefold to $10.84 billion this year and reach $26.12 billion the next, according to a recent presentation for potential investors seen by Reuters. The ride-hailing service, which operates in over 50 countries, keeps 20 percent of booking revenue, showed a confidential slideshow prepared by Chinese bankers with input from Uber, aimed at soliciting investment in a fund participating in Uber's Series F financing. A spokeswoman at Uber's San Francisco headquarters, when asked about the presentation, said the company does not comment on "rumor and speculation." The undated presentation featuring data from as recently as June offers a glimpse of the explosive growth of the six-year-old firm, last valued by investors at $50 billion - the most for a privately held technology firm worldwide.