Question

the selling price of 15 articles is equal to the cost price of 12 articles.find the gain or loss percent.

Answer 1

TakeCP=12x,SP=15x
Here sp>cp so, we get profit/gain
P=3x
P%=(3x/12x)100
=(1/4)100
=25%

Answer 2

let the CP of one article = X

find the cost price of the 15 article :

15 article = 12 x

since the SP is less than the cost price so the loss =15x -12x=3x

Loss%=3x/15x ×100 =20% Ans