Given, printed price of article = Rs. 850
Discount =4 %
Profit =20 %
Selling price =850−(4100×850)
=850−34
= Rs. 816
Let cost price = Rs. x
Gain % =(S.P.−C.P.C.P.)×(100)
⇒20=(816−xx)×100
⇒5(816−x)=x
⇒4080−4x=x
⇒4080=6x
⇒x=680
∴ the cost price of the article is Rs. 680.