Sensex tanks 900 points, gives up 50,000 (2nd Ld)
49,960.88, lower by 928.88 points or 1.83 per cent from its previous close of 50,889.76.The Nifty50 was at 14,741.25Â points, lower by 240.50 points or 1.61 per cent from its previous close.
--IANS rrb/sn/in