Two 180-horsepower water pumps are being considered for installation in a farm. Financial data for these pumps are as follows:

If power cost is a flat 6 cents per kWh over the study period, determine the minimum number of hours of full-load operation per year that would justify the purchase of the more expensive pump at an interest rate of 8% (1 HP = 746 watts = 0.746 kilowatts).

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Item Pump I Pump II Initial cost $6,000 $4,000 Efficiency 86% 80% 12 years 12 years Useful life Annual operating cost $500 $440 $0 $0 | Salvage value