The Sensex at the Bombay Stock Exchange closed 90 points, or 0.4 percent higher, at 20,340, on sustained buying by foreign funds, amid positive global cues, today. The Nifty at the National Stock Exchange gained 32 points, or 0.5 percent, to 6,136. Other Asian markets in China, Hong Kong, and Singapore gained between 0.3 percent and 2.5 percent, on expectations that the US central bank will go for a second round of quantitative easing to support the economy.