In an already operational pharmaceutical plant, you are considering three alternative solvent-recovery systems to replace an existing combustion process. The internal hurdle rate is 15% after taxes over eight years. Which alternative do you recommend?

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Alternative A B Total Module Cost of System Natural Gas Savings ($ Savings in Solvent Cost ($ Net Maintenance Savings ($ ($ thousands) thousand/y) thousand/y) thousand/y) 88 125 250 15 15 15 25 45 75 33 25 18