Terry Inc. manufactures machine parts for aircraft engines. CEO Bucky Walters is considering an offer from a subcontractor to provide 2, 600 units of product OP89 for $169,000 If Terry does not purchase these parts from the subcontractor, it must continue to produce them in-house with these costs: Calculate the relevant cost for producing the product. Calculate the additional cost or savings of producing the product internally versus purchasing the product externally, from a supplier