Chipmaker Intel Corp (INTC.O) on Thursday raised its outlook for the second quarter and the full year, citing stronger-than-expected demand for personal computers used by businesses. Shares of Intel jumped more than 4 percent in extended trade as the chipmaker’s improved forecast lifted hopes for a PC industry that been shrinking due to consumers’ preferences for tablets and smartphones. Intel said it now expects second-quarter revenue of $13.7 billion, plus or minus $300 million. Intel had previously forecast revenue of $13 billion, plus or minus $500 million.