NOB- Delhi news: The central government has given a huge shock to the common man. Import duty on cooking oils has been increased to 20 percent. With this, the import tax on sunflower, soybean, refined palm oil and groundnut has increased from 12.5 percent to 32.5 percent. The prices of all types of oil have gone up by Rs.15-20 per litre. The price of palm oil increased from Rs.100 to Rs.115-120, sunflower from Rs.115 to Rs.130-140, groundnut oil from Rs.155 to Rs.165-170.