Integrated textiles company Alok Industries on Monday reported 77.73 per cent growth in net profit after tax to Rs 283.50 crore for the quarter ending March 31. Profit after tax during 2010-11 stood at Rs 159.59 crore, the company said. The company's net sales grew 18.2 per cent to Rs 2,595.4 crore over Rs 2,195.87 crore in the same period of the last year.