The BSE benchmark Sensex tumbled 820.97 points or 1.03 per cent to settle at 78,675.18. During the day, it plunged 948.31 points or 1.19 per cent to 78,547.84. The BSE benchmark Sensex tumbled 820.97 points or 1.03 per cent to settle at 78,675.18. During the day, it plunged 948.31 points or 1.19 per cent to 78,547.84. Zee News :Business