BY A STAFF REPORTER: Petroleum and oil marketing companies have increased the price of commercial liquefied petroleum gas (LPG) cylinders by Rs 350.50 per unit and domestic LPG cylinders by Rs 50 from Wednesday. As per the revised prices, the price of commercial LPG cylinders has now gone up to Rs 2,119.50 per unit in Delhi and domestic LPG cylinders in the national capital to Rs 1,103 per unit.