mobile apps To organize the process of supplying gasoline for cars

iam an university student i need to support my project on college with an android app the problem is ,, solve an proplem in egypt the idea of this project is to put an android Tablet on very gas station on egypt .on this taplet there are app connect with sql database on internet on this data pass there are all the data of all cars in egypt the problem is ,, for every type of cars on egypt there are price of the Benzene ..some time there olso an fixed amount of the Benzene for very car ,, and this amount change from car to car as example the price of Benzene for one lit of Benzene for a bus is 1 $ for the first 300 lit then 4 $ for the next 200 lit thin 6 $ for the rest litres but for a car is 2$ for the first 200 lit and 3 $ for the next 100 lit and 5$ for the rest of the Benzene litres the app i want will help the gas station man to know how much of Benzene can be offer for very car and what is the price and after he take the Benzene send to the server the details of the car an how much of the Benzene this car toke ,so if this car go to any anther gas station the thplet will know all the details of it this is all ,, if u will agree i will tell u all the information you need to mack this app thank u