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Make or Buy Terry Incorporated manufactures machine parts for aircraft engines. CEO Bucky Walters is considering an offer from a subcontractor to provide 3,000 units of product OP89 for $360,000. If Terry does not purchase these parts from the subcontractor, it must continue to produce them in-house with these costs: Required: 1. What is the relevant cost per unit to make the product internally? 2. What is the estimated increase or decrease in short-term operating profit of producing the product internally versus purchasing the product from a supplier