Hindustan Unilever witnessed a 15 per cent increase in net profit for the fiscal fourth quarter ended March 31, 2013, at Rs. 787.20 crore, the company's management announced on Monday. Its sales grew 10.4 per cent year on year to Rs. 6,367.14 crore, while volumes growth, which was a major area of concern for the consumer goods major, came in at 6 per cent as against analyst estimates of 5.25-5.5 per cent. Sanjay Manyal, research analyst at ICICI Direct says the volume growth is a big positive.