The brake power of a four-cylinder engine is $30 \mathrm{~kW}$ with all cylinders firing and $20 \mathrm{~kW}$ with any one cylinder cut. The mechanical efficiency of the engine in percent is

(A) 60

(B) 67

(C) 75

(D) 83

The brake power of a four-cylinder engine is $30 \mathrm{~kW}$ with all cylinders firing and $20 \mathrm{~kW}$ with any one cylinder cut. The mechanical efficiency of the engine in percent is

(A) 60

(B) 67

(C) 75

(D) 83

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