The selling price of an article is 
of the cost price. The gain per cent is
Let × be the CP
SP = 6x/5
Gain = SP –CP
= 6x/5 – x
=x/5
= 20%
9
The selling price of an article is of the cost price. The gain per cent is
Let × be the CP
SP = 6x/5
Gain = SP –CP
= 6x/5 – x
=x/5
= 20%