The average marks obtained in a class of $50$ students is $70 \%$. The average of the first $25$ students is $60 \%$ and that of the next $24$ students is $80 \%$. What is the percentage of marks obtained by the last student?

  • A
    $90$
  • B
    $60$
  • C
    $80$
  • D
    $70$

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