Liquefied Petroleum Gas or LPG is concluded of propane and butane hydrocarbons. The percentage of mixture between propane and butane in producing LPG is very important. In summer when the weather is warm one increases the percentage of butane but in the winter by increasing of propane one helps in fact for better evaporation, generally the percentage of propane in LPG fluctuates between 10% to 50%. The ratio of butane and propane ranges from 50/50, 60/40 and 70/30 depending on the region and demand. The base of the price is announced monthly by ARAMCO