NEW YORK Shares of Research in Motion jumped 20% in premarket trades Friday after the tech firm’s better-than-expected results. Analysts at Wells Fargo hiked their fiscal 2013 sales view for the BlackBerry maker to $ 11.16 billion from $ 9.57 billion. Analysts expect the company to report a 2013 loss of $ 1.37 a share, compared to their earlier view for a profit of $ 1.88 a share. Wells Fargo reiterated its market perform rating on Research in Motion and said it faces continued challenges because of “increased competition, aggressive global pricing pressure, lower device shipments and increased marketing expenses.” [...]