The word "discount" makes us think -- what a great deal! But is the sale worth paying the subscription cost? Should I take the flat rebate or percentage-off sale? Functions can help us decide. This three-tiered application problem set can be used to differentiate or scaffold the learning. Level 1 -- Write functions based on Charlotte's desire for fitness equipmentLevel 2 -- Write a set of functions for both of Davis's part-time job opportunities to help him decide which to takeLevel 3 -- Work