India's economy grew a better than expected 7.6 per cent in the September quarter from a year earlier, but eased from the previous quarter's 7.9 per cent as monetary tightening curbed demand.The annual growth for India's fiscal second quarter was higher than a median forecast of 7.3 per cent in a Reuters poll of economists.The manufacturing sector grew 5 per cent in the July-September quarter from a year earlier, while the farm sector expanded an annual 2.7 per cent, government data showed on Friday.