If theselling price of 10 pens is equal to cost price of 14 pens, find the gain percent.
Selling price of 10 pens = cost price of 14 pens
Let cost price of 1 pen = Rs. X
Selling price of 10 pens = Rs.14X
Selling price of 1 pen =Rs. 
Gain = 
= 
= 
9
If theselling price of 10 pens is equal to cost price of 14 pens, find the gain percent.
Selling price of 10 pens = cost price of 14 pens
Let cost price of 1 pen = Rs. X
Selling price of 10 pens = Rs.14X
Selling price of 1 pen =Rs.
Gain =
=
=