fire tint, inc., (fti), applies tint to airplane canopies (front windows) manufactured by other companies. when the canopy manufacturer asks fti to tint a canopy, fti tracks the manufacturer, model number, and the cin, a unique serial number assigned to each individual canopy by the manufacturer. fti has a finite set of standard treatments it applies to canopies. each treatment applied by fti has a treatment number, treatment description, and a published price for each treatment. although there is a published price for each treatment type, fti often negotiates the actual price for each treatment when a manufacturer places an order. sometimes more than one different treatment is applied to the same canopy. when a treatment is applied to a canopy, fti keeps track of the treatment applied, the date it was applied, and the start and end time of when the treatment was applied, and the negotiated actual price.