The Sensex at the Bombay Stock Exchange shot up 320 points, or 1.6 percent, to regain the psychological 20,000 point level, at 20,192, in afternoon trade, today, on news of easing food inflation. Earlier this morning, the Sensex had opened a more modest 87 points higher, on fresh buying by investors.Other Asian bourses in China, Japan, Singapore, South Korea, Hong Kong and Taiwan were trading mixed, today, after data showed that China's economic growth slowed in the third quarter. Over in the US, the Dow Jones Industrial Average had rallied 1.2 per cent, overnight, on some better-than-expected quarterly corporate results.