The Bombay Stock Exchange (BSE) has reported a profit after tax (PAT) of Rs 55.62 for the quarter ended September 30. This is a nearly 10 per cent rise on a quarter-on-quarter basis. The profit number has been derived from deducting PAT for the quarter ended June 30 from the figure for the six-month period ended September 30, 2010. The exchange, in a release, pegged PAT for the half-year ended September 30 at Rs 106.39 crore. According to the consolidated numbers, the exchange earned a total income of Rs 241.41 crore during the six-month period between April and September. Investment and deposits were the single-highest income source and accounted for Rs 114.79 crore.