Mumbai, Jan. 12 :    Mumbai, Jan. 12:  Mastek Ltd today reported a 54 per cent drop in net profit for the quarter ended December 31, 2000. Net profit plummeted to Rs 2.80 crore as against Rs 6.10 crore in the corresponding period of the previous year. Income from operations during this period went down to Rs 20.90 crore against Rs 22.43 crore in the same previous period.