Mumbai: Indias largest private lender HDFC Bank on Wednesday reported a 2.2 per cent rise in its net profit for Q3 this fiscal, as its gross non-performing assets (NPA) ratio rose during the quarter. For the December quarter, the banks profit stood at Rs 16,736 crore, compared to Rs 16,373 crore in the same period last year. Net interest income, or the banks core income, rose nearly 8 per cent (year-on-year) to Rs 30,650 crore. Core net interest margin stood at 3.43 per cent for the bank