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Two 180-horsepower (HP) motors are being considered for installation at a municipal sewage-treatment plant. The first costs $5,100 and has an operating efficiency of 78%. The second costs $3,500 and has an efficiency of 75%. Both motors are projected to have zero salvage value after a life of 10 years If all the annual charges, such as insurance maintenance, etc., am ount to a total of 13% of the original cost of each motor, and if power costs are a flat five cents per kilowatt-hour, how many minimum hours of full load operation per year are necessary to justify purchasing the more expensive motor at 12%? A conversion factor you might find useful is 1 HP-746 watts 0.746 kilowatts.) Click the icon to view the interest factors for discrete compounding when 12% per year A minimum of hours of full-load operation per year are necessary to justify purchasing the more expensive motor. (Round up to the nearest whole number.) Two 180-horsepower (HP) motors are being considered for installation at a municipal sewage-treatment plant. The first costs $5,100 and has an operating efficiency of 78%. The second costs $3,500 and has an efficiency of 75%. Both motors are projected to have zero salvage value after a life of 10 years If all the annual charges, such as insurance maintenance, etc., am ount to a total of 13% of the original cost of each motor, and if power costs are a flat five cents per kilowatt-hour, how many minimum hours of full load operation per year are necessary to justify purchasing the more expensive motor at 12%? A conversion factor you might find useful is 1 HP-746 watts 0.746 kilowatts.) Click the icon to view the interest factors for discrete compounding when 12% per year A minimum of hours of full-load operation per year are necessary to justify purchasing the more expensive motor. (Round up to the nearest whole number.)