State-owned Bharat Petroleum Corporation Ltd (BPCL) reported returning to profitability in the September quarter after a boost in marketing margin improved earnings. Consolidated net profit in July-September was at Rs 8,243.55 crore compared to a loss of Rs 338.49 crore in the same period a year back, the company said in a statement. The profit was aided by a boost in marketing margins as a freeze on petrol and diesel price revision despite a fall in input crude oil prices helped recover losses incurred when rates were high last year.