Glick Corporation offers a 10% volume discount to customers who purchase more than 10,000 units of its yoga mats in a calendar year. The volume discount applies to all units purchased in the year, not just the units above 10,000. Once a customer exceeds 10,000 units, it receives a credit for 10% of the cost of its first 10,000 units and it is subsequently billed only 90% of the list price for units purchased for the remainder of the year.