Reliance Industries Limited (RIL) on Friday reported a decline of 21.20 per cent in its net profit, which stood at Rs4,236 crore in the fourth quarter of 2011-12 compared to Rs5,376 crore in the corresponding period of 2010-11. The company’s total income rose by 18.86 per cent to Rs87,477 crore in January-March quarter as compared to Rs73,591 crore in the corresponding quarter 2010-11. Net sales stood at Rs85,182 crore, an increase of 17.21 per cent from Rs72,674 crore in the quarter ended March 31, 2011. The results came after the markets closed.