Ahmedabad-based Cera Sanitaryware Limited has posted a 27.94 per cent rise in its net profit at Rs 6.09 crore for the second quarter ended September 30 of the financial year 2010-11, up from Rs 4.76 crore for the corresponding period last year.The company, which is into manufacturing sanitaryware, also saw a 20.85 per cent increase in its net sales at Rs 56.85 crore for the second quarter of current fiscal.