Orange County Computers is trying to decide whether to continue producing the screws it uses to hold together the outer casing of its computers or to purchase the screws from Nuts & Bolts. Which of the following is not a relevant cost the OCC should consider when making this decision?

		The melted metal that comprises the raw materials.
		The deprecation on the machine used to thread the screws.
		Shipping costs charged by Nuts & Bolts, Inc.
		Salaries of workers whose job is to place screws into boxes and move them to the other side of the factory