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What is the coefficient of performance of a system, if its work input is 50 J and heat removed is 35 J?

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What is the coefficient of performance of a system, if its work input is 50 J and heat removed is 35 J?

(a) 35%

(b) 50%

(c) 70%

(d) 95%

The question was posed to me in unit test.

This intriguing question comes from Efficiency topic in portion 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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Correct answer is (c) 70%

Easy explanation: Coefficient of performance = 35/50*100 = 70%.

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