Mumbai: Mahindra & Mahindra Financial Services reported a 55% year-on-year rise in standalone net profit to Rs 882 crore for the quarter ended September 30, compared with Rs 569 crore a year earlier, helped by higher business volumes and lower credit costs.Revenue from operations rose 15% to Rs 5,164 crore. Net interest income increased 17% to Rs 2,822 crore.On a consolidated basis, net profit rose 61% to Rs 911 crore and consolidated total assets grew 21% to Rs 1.80 lakh crore.Credit cost moderated to 1.6% of average total assets from 2.2% a year earlier, while net interest margin remained unchanged at 7%.