Question

If the cost price of 12 pens is equal to the selling price of 16 pens, find the loss per cent.

Answer 1

Let x be the CP of Pen 

SP of 1 pen = x/16 

CP of 1 Pen = x/12 

Loss = CP – SP 

= x/12 – x/16 

= x/48

\(Loss\%=\frac{Loss\,\times\,100}{CP}\)

\(=\frac{\frac{x}{48}\times100}{\frac{x}{12}}\)

= 25%