Question: In the VanBuren machine replacement problem, the companys current policy is to keep a machine at least four quarters but no more than 12 quarters.

In the VanBuren machine replacement problem, the company’s current policy is to keep a machine at least four quarters but no more than 12 quarters. Suppose instead that the company imposes no upper limit on how long it will keep a machine; its only policy requirement is that a machine must be kept at least four quarters. Modify the spreadsheet model appropriately. Is the new optimal solution the same as before?

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