The Sensex was trading 136 points up at 20,928 points a shortwhile ago. It rose 70 points to 20,863 in early trade today. The rise was attributed to sustained buying by funds, as the economy grew by a higher-than-expected 4.8 per cent in the September quarter, amid a mixed trend at other Asian bourses. The 30-share barometer had gained nearly 372 points in the previous two sessions.The Nifty was also trading 48 points up 6,224 points a shortwhile ago.