Business: The stock market opened with gains on the first trading day of the week i.e. Monday. The 30-share Sensex jumped 270.76 points or 0.32 per cent to 84,482.64 by 9:27 in early trade. Whereas the 50-share Nifty is trading at 25,880.15, up 85.0 points or 0.33 percent.