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What is the coefficient of performance of a system, if its work input is 75 J and heat removed is 45 J?

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What is the coefficient of performance of a system, if its work input is 75 J and heat removed is 45 J?

(a) 20%

(b) 40%

(c) 60%

(d) 80%

I had been asked this question by my college director while I was bunking the class.

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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The correct answer is (c) 60%

The best I can explain: Coefficient of performance = 45/75*100 = 60%.

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