A print shop at a community college in Cupertino, California, employs two different contractors to maintain its copying

Question

A print shop at a community college in Cupertino, California, employs two different contractors to maintain its copying machines. The print shop needs to have 14 IBM, 19 Xerox, and 24 Canon copying machines serviced. Contractor A can repair 2 IBM, 1 Xerox, and 2 Canon machines at a cost of $900 per month, while Contractor B can repair 1 IBM, 3 Xerox, and 2 Canon machines at a cost of $950 per month. How many months should each of the two contractors be employed to minimize cost?

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