An office supply company is attempting to determine the order quantity for laser printer toner cartridges which are sold to local businesses. Annual demand is 20,000 units and each cartridge costs the store $25. It costs $30 to place an order and the inventory carrying cost rate is 25% of the value of the item. The following spreadsheet has been set up to solve the problem. What cell is the variable cell in this problem? 
Definitions:
Defensive Self-esteem
A form of self-esteem characterized by fragility and vulnerability, often dependent on external validation and defensive in the face of criticism.
Low Level of
is a phrase indicating a minimal or reduced quantity, intensity, or degree of a specific quality or attribute.
Self-efficacy
An individual's belief in their own capacity to execute behaviors necessary to produce specific performance attainments.
Self-worth
An individual's subjective valuation of their own value or worth as a person.
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