I can't seem to get past part B down I know I need find contribution per unit but can't seem to figure it out?

Assume that Painless Dental Clinics, Inc., offers three basic dental services. Variable Cost per Unit Cleaning Filling Capping Price per Unit $ 280 560 1,400 $160 540 740 Units Sold per Year 9,000 900 100 Variable costs include the labor costs of the dental hygienists and dentists. Fixed costs of $480 equipment costs, marketing costs, and the costs of administration. Painless Dental Clinics is sub income. A cleaning "unit" is a routine teeth cleaning that takes about 45 minutes. A filling "unit" is the wo one session. A capping "unit" is the work done to put a crown on one tooth. If more than one to clinic counts one unit per tooth (e.g., putting crowns on two teeth counts as two units). Required: a. Given this information, how much will Painless Dental Clinics, Inc., earn each year after taxes? b. Assuming the given sales mix is the same at the break-even point, at what sales revenue doe even