Bank stocks slumped on concern the Reserve Banks latest measures would spark an interest rate increase, besides making it costlier for lenders and financial companies to raise short-term funds. Rate-sensitive auto stocks also declined. The 30-share Sensex opened lower at 19,788.09 and dropped to a low of 19,649.58. It recovered later to 19,890.63, before ending at 19,851.23, still a loss of 183.25 points, or 0.91%. The index had gained 740.36 points, or 3.84%, in the previous three days.