Water PumpScience brain teasers require understanding of the physical or biological world and the laws that govern it.You have a 100 ft deep well, and your water pump is damaged and in need of repair. You hire two plumbers to quote you a new pump. One says that he will replace the existing submersible pump with a similar model for $200. The other says that he will sell you a high efficiency vacuum pump, which will cost you $50 less and will have the added benefit that you can keep it in your basement for easy maintenance instead of having to put it back down the well. Which pump should you buy?
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