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Energy out and Energy in of a system are 5 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 5 J and 25 J respectively, what is the efficiency of the system?

(a) 20%

(b) 40%

(c) 60%

(d) 80%

I have been asked this question in an interview for internship.

This intriguing question comes from Efficiency 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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Right answer is (a) 20%

For explanation: Efficiency = 5/25*100 = 20%.

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