A battery manufacturing plant has been ordered to cease discharging acidic waste liquids containing mercury into the city sewer system. As a result, the form 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 Income Annual from Installed Operating Mercury Salvage Cost Recovery Value Bidder Cost $ 35,000 S8000 Foxhill $2000 $20,000 Instrument Quicksilver 40,000 7000 2200 100,000 2000 3500 Almaden