In a class, the average score of girls in an examination is 73 and that of boys is 71. The average for the whole class is 71.8. Find the percentage of girls. 
  • a)
    35%
  • b)
    50% 
  • c)
    40% 
  • d)
    80% 
Correct answer is option 'C'. Can you explain this answer?
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