Genpact on Friday posted a 20 per cent growth in its net profit to $87.3 million in the September quarter compared with the corresponding quarter last year. The revenue at $617.8 million grew five per cent when compared with the year-ago period. The NYSE-listed company's BPO revenues grew eight per cent year-on-year at $484 million though its information technology services business declined five per cent year-on-year.