Sensex opens 80pts lowerBS Reporter / Mumbai September 2, 2009, 9:58 ISTThe Sensex has today opened at 15,471, down 80 points. The index is now at 15,454, down 96 points.The NSE Nifty has opened at 4,574, down 42 points. The index is now at 4,599, down 25 points.