The efficiency of a internal combustion engine normally is of the order of a. 15-20 % b. 20-25% c. 25-30% d. 30-35%

The efficiency of a internal combustion engine normally is of the order of  a. 15-20 %  b. 20-25%  c. 25-30%  d. 30-35%  
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ANSWER  d. 30-35%
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