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Energy out and Energy in of a system are 15 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 15 J and 25 J respectively, what is the efficiency of the system?

(a) 40%

(b) 60%

(c) 80%

(d) 110%

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

My query is from Efficiency in section 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 option is (b) 60%

To elaborate: Efficiency = 15/25*100 = 60%.

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