Federal Bank posted a 0.9 per cent rise in second-quarter net profit on Tuesday, helped by higher interest income.Net profit was Rs 266 crore ($36.08 million) in the quarter ended September 30, compared with Rs 264 crore a year earlier, the mid-sized private-sector lender said.Eleven analysts, on average, had expected a net profit of Rs 2.14 crore, according to I/B/E/S data from Refinitiv.Gross bad loans as a percentage of total loans stood at 3.11 per cent at September-end compared with 3 per cent in the previous quarter and 2.39 per cent a year earlier.Interest earned rose 16.2 per cent to Rs 2765 crore.The bank's shares rose as much as 7.5 percent after the results.