The average salary of the entire staff in an office is $Rs. 500$ per day. The average salary of officers is $Rs. 750$ and that of non-officers is $Rs. 250$. If the number of officers is $15$,then find the number of non-officers in the office?

  • A
    $25$
  • B
    $10$
  • C
    $15$
  • D
    $20$

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