Every time you buy a gallon of Golden Gallon milk, you can have your Golden Gallon milk card punched. When the card has 12 punches, your thirteenth gallon of milk is free. Golden Gallon is using a _____ discount.

Every time you buy a gallon of Golden Gallon milk, you can have your Golden Gallon milk card punched. When the card has 12 punches, your thirteenth gallon of milk is free. Golden Gallon is using a _____ discount.



Answer: Cumulative quantity


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