NEW DELHI: With economic activity picking up and hopes of a normal monsoon buoying sentiments, sales of passenger vehicle went up by a strong 14.68 per cent to 2,77,602 units in April.As per data released by industry body Society of Indian Automobile Manufacturers ( SIAM ) sales of passenger vehicles stood at 242060 units in the year-ago period.Sales of commercial vehicles, however, declined by 22.9 per cent to 41,490 units in the period under review.Two-wheeler sales went up by 7.34 per cent to 16,74,796 units driven by demand for scooters. While sales of scooters increased by 25.3 per cent to 5,86,886 units last month, those of motorcycles remains flat at 10,29,972 units.Overall sales of vehicles across categories went up by 6.8 per cent to 20,30,476 units.