Since profit is given as
20%, selling price will be
(1+0.2)xThus, selling price would be 1.2x.
When C.P. and S.P. are Rs. 20 less then,
C.P. =x−20
S.P. =1.2x−20
According to the given condition,
Now, 1.2x−20=1.3×(x−20)
⇒1.2x−20=1.3x−26
⇒1.3x−1.2x=−20+26
⇒0.1x=6
⇒x=60
therefore, the cost price of the article is Rs. 60.