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(C) Let the number of non-officer staff be $x$.The total salary of officers is $15 	imes 750 = 11250$.The total salary of non-officers is $x 	imes 2

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$15$

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(C) Let the number of non-officer staff be $x$.The total salary of officers is $15 	imes 750 = 11250$.The total salary of non-officers is $x 	imes 250 = 250x$.The total number of staff is $(15 + x)$.The average salary of the entire staff is given by the formula: $	ext{Average} = \frac{	ext{Total Salary}}{	ext{Total Number of Staff}}$.Therefore,$500 = \frac{11250 + 250x}{15 + x}$.Multiplying both sides by $(15 + x)$,we get: $500(15 + x) = 11250 + 250x$.$7500 + 500x = 11250 + 250x$.$500x - 250x = 11250 - 7500$.$250x = 3750$.$x = \frac{3750}{250} = 15$.Hence,the number of non-officer staff is $15$.

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?

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