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:
Labor Per Unit
Refers to the amount of labor required to produce a single unit of a product, indicating efficiency and productivity levels.
Long-run Average Cost Curve
A curve that shows the lowest cost at which a firm can produce any given level of output in the long run, when all inputs are variable.
Monthly Production
The total quantity of goods or services produced by a company, industry, or economy over the span of a month.
Production Cost
The total expense incurred in manufacturing a product or offering a service, including raw materials, labor, and overheads.
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