The Sensex at the Bombay Stock Exchange ended with a marginal loss of 10 points, or 0.1 percent, at 20,346, today, after the Reserve Bank raised key policy interest rates for a sixth time this year. The Nifty at the National Stock Exchange managed to gain just 1 point, at 6,119.Stock markets in Japan, Hong Kong, Singapore and South Korea edged up by between 0.1 percent and 0.4 percent, ahead of US elections, and a widely expected additional monetary-easing program by the US central bank.