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find runtime hours that makes these two motors economically equal...

Question: find runtime hours that makes these two motors economically equal...

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Find runtime hours that makes these two motors economically equal.

2.14 Two electric motors are available to satisfy a continuous demand of 85 kW. Motor 1 has an initial cost of $5,500 with an operating efficiency of 91%. Motor 2 has an initial cost of $4,000 with an operating efficiency of 89%. Each motor has a life of 10 years with no salvage value. The annual cost of electricity to run the machines is $19.20 per kW of demand plus $0.12 per kWh of energy use. Determine the

Engineering Economics number of runtime hours that makes these two motors economically equivalent to each other if the MARR is 22%

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