Kathmandu, Dec 15: Nepal Oil Corporation has reduced the prices of diesel and kerosene by four rupees per litre with effect from midnight today. However, the price of petrol has been increased by two rupees per litre.With the price adjustment, the price of diesel and kerosene is now fixed at 139.50 rupees per liter for the grade 1 region, 141 rupees for the grade 2 and 142 rupees for the grade 3. Similarly, petrol has been fixed at 160.50, 162 and 163 rupees for the first, second and third grade of regions respectively.The price of aviation fuel and cooking gas...