Racer Scooters plans to sell a motorized standard scooter for $54 and a motorized chrome scooter for $78. Racer Scooters purchases the standard scooter for $36 and the chrome scooter for $50. Racer Scooters expects to sell two chrome scooters for every three standard scooters. Racer Scooters' monthly fixed expenses are $9,680. How many of each type of scooter must Racer Scooters sell monthly to break even? To earn $6,600? First, identify the formula to compute the sales in units at various levels of operating income using the contribution margin approach. Break-even sales in units