The variable costs of labor and material are $8 per unit. The company has an offer from a major subcontractor to produce the part for $12 per unit. However, the subcontractor wants the company to share in the costs of the equipment. The electronics company estimates that the total cost would be $3.1 million, which also includes management oversight for the new supply contact. The company must consume more than diaphragms to make the manufacturing the part in-house option least costly. (Enter your response rounded up to the nearest whole number.)