The BSE benchmark Sensex rose by over 72 points in early trade today on continued buying by funds and retailers after Prime Minister Manmohan Singh yesterday said the government is determined to take tough decisions to revive the economy. The 30-share barometer, which had gained nearly 154 points in yesterday's session, rose by 0.43 per cent,to 16,932. with metals, capital goods and auto sector stocks leading the rise.Similarly, the wide-based National Stock Exchange index Nifty moved up by nearly 20 points, or 0.39 per cent, to 5,123.