Cloud service provider Rackspace Hosting's (RAX) first-quarter per-share profit is expected to jump 80%, while revenue rises 31% to $300.5 million. Analysts polled by Thomson Reuters estimate Rackspace will earn 18 cents per share, up from EPS of 10 cents in the year-earlier period. It reports results on Monday after the market close. San Antonio-based Rackspace gets more than 20% of its revenue from cloud services, where customers rent computing