The Sensex at the Bombay Stock Exchange slumped 240 points to 17,534, today, on fears of an imminent interest rate hike, and amid weak Asian and European markets. The Nifty at the National Stock Exchange dropped 77 points, to 5,256.Stock markets markets in Japan, China, Hong Kong, Singapore and South Korea slid between 1.3 percent and 4.3 percent, on concerns that economic growth in China is slowing.