Prove the identity. 
Definitions:
Variable Manufacturing Cost
Costs in manufacturing that vary with the level of output, including costs such as raw materials and direct labor.
Unit Product Cost
The total cost (direct materials, direct labor, and manufacturing overhead) associated with producing one unit of a product.
Reduced Price
The selling price of a product or service after it has been discounted from the original or standard price.
Annual Financial Advantage
Annual Financial Advantage refers to the financial benefit realized on an annual basis from a particular investment or decision.
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