The stock markets gave a rousing cheer to the Union Budget and Sensex at the Bombay Stock Exchange shot up a huge 486 points, or 1(point)8 percent, to an over 3-month closing of 28,142.The Nifty at the National Stock Exchange surged 155 points, to 8,716.And at the forex market, the rupee posted its biggest single-day gain this year, strengthening a hefty 40 paise, to 67.47 against the dollar.