Increase in input costs continued to put pressure on the margins and profits of Ambuja Cements Ltd. (ACL) which reported a 12 per cent drop in net profit for the quarter ended March 2011 at Rs.407 crore against Rs.462 crore in the year-ago period.

Sales were up 11 per cent at Rs.2,207 crore against Rs.1,990 crore) Operating profit dipped 3.7 per cent to Rs.627 crore from Rs.651 crore.