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Energy out and Energy in of a system are 40 J and 25 J respectively, what is the efficiency of the system?

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Energy out and Energy in of a system are 40 J and 25 J respectively, what is the efficiency of the system?

(a) 40%

(b) 80%

(c) 160%

(d) 200%

The question was asked in a job interview.

My enquiry is from Efficiency topic in chapter Energy Balances that Include the Effects of Chemical Reaction, Ideal Processes, Efficiency and the Mechanical Energy Balance and Heats of Solution and Mixing of Basic Chemical Engineering

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Best answer
The correct answer is (c) 160%

The explanation is: Efficiency = 40/25*100 = 160%.

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