Find the differential of the function. 
Definitions:
Weighted-Average Method
A costing method used in process costing that averages the costs of all units available for sale during a period, both beginning inventory and produced during the period.
Ending Work
The work or tasks that are in process or yet to be completed at the end of a reporting period.
Process Inventory
Inventory that consists of items that are in various stages of being processed in a manufacturing environment but are not yet completed products.
Cost System
A method for collecting, recording, and analyzing costs related to a specific way of managing expenses within an organization, project, or process.
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