If the cost price of 18 chairs be equal to selling price of 16 chairs, find the gain or loss percent.
C.P of 18 chairs = S.P of 16 chairs
= Rs. 100 (Suppose)
C.P of 1 chair =Rs.10018=Rs.509
and S.P of 1 chair =Rs.10016=Rs.254
Gain = S.P - C.P =Rs.254−509