A battery manufacturing plant has been ordered to cease discharging acidic waste liquids containing mercury into the city sewer system. As a result, the firm must now adjust the pH and remove the mercury from its waste liquids. Three firms have provided quotations on the necessary equipment. An analysis of the quotations provided the following table of costs.

If the installation can be expected to last 20 years and money is worth 7%, which equipment should be purchased?

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Annual ncome rom Annual Bidder Foxhill InstalledOperating Mercury Salvage Recovery Value $2000 $20,000 Cost Cost 35,000 $8000 7000 Instrument Quicksver 40,000 100,000 2200 3500 Almaden 2000