Sell something for me

Billing and Inventory Software for Vehicle(Car/Bike) Service Center High level features of the software 1.) User can do billing and printout (sales/service entry0 2.) purchase and payment entry 3.) user can know in a seconds how much amount is due 4.) user can know in a second how much sales was done in a day or given period 5.) user can know in a second what items (with quantity) were sold in a day or given period 6.) user can know stock and can find out what is out of stock etc