Sterlite Industries (India) Ltd has reported a 32 per cent increase in profit after tax at Rs 0.29 billion (Rs 29.87 crore) from Rs 0.22 billion (Rs 22.67 crore) in the year-ago period. Net sales edged down to Rs 7.23 billion (Rs 723.64 crore) from Rs 7.26 billion (Rs 726.53 crore) and other income fell to Rs 0.38 billion (Rs 3.74 crore) from Rs 0.6 billion (Rs 6.25 crore). Exports during the quarter stood at Rs 0.9 billion (Rs 90 crore). Copper sales rose to 39,946 tons, up by 23 per cent from the year-ago period. Interest cost rose to Rs 0.38 billion (Rs 37.73 crore) from Rs 0.13 billion (Rs 13.71 crore). Cash profit was at Rs 0.63 billion (Rs 63.32 crore) from Rs 0.46 billion (Rs 46.44 crore).