The Sensex has tumbled to the day's low and is now down 112 points at 10,339.ACC has plunged 4.5% to Rs 751. Hindalco and Satyam have tumbled over 4% each to Rs 172 and Rs 641, respectively.Out of 2,367 stocks traded so far, 1,458 have declined, 848 have advanced and the rest are unchanged.