SEVERAL STAGES SETTING METHOD OF OIL SUPPLY UNIT PRICE

PROBLEM TO BE SOLVED: To diversity settings of a selling price for allowing a selling method having a feature for example, a unit price of oil supply becomes cheaper as an oil supply amount increases, because sometimes a unit price of oil supply is reduced when performing sales promotion at an oil supply facility, but there is a failure that benefit reduces if a selling amount does not increase relatively.SOLUTION: A unit price of oil supply of fuel is set to several stages according to an oil supply amount, so that the unit price becomes an oil supply unit price corresponding to an oil supply amount relatively and thereby a selling amount per one customer is promoted or suppressed.