Different Lives 6-45 A pump is needed for 10 years at a remote loca- tion. The pump can be driven by an electric motor it a power line is extended to the site. Otherwise, a gasoline engine will be used. Use an annual cash flow analysis and an 6% interest rate. How should the pump be powered? Gasoline Electric First cost Annual operating cost Annual maintenance Salvage value Life, in years $2400 1200 300 300 $9000 250 50 600 10