Find 
by implicit differentiation. 
Definitions:
Total Cost
The aggregate amount of money spent on or required for goods or services, including direct and indirect costs.
Beginning Inventory
The worth of products ready for purchase or utilization at the beginning of a financial period.
Beginning Inventory
The worth of merchandise ready for purchase at the beginning of a financial period.
Net Operating Income
The total profit of a business after operating expenses are subtracted from gross profit.
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