A retailer gives 36% discount to his customer on the marked price of an article. In this transaction he earns a profit of 36% on the article. If the article costs ₹4,200 to the retailer, what is its marked price (in ₹)?

We can use the direct relation between Cost Price (CP) and Marked Price (MP):
CP
MP
​
=
100−Discount %
100+Profit %
​

Given:
CP=₹4,200
Profit %=36%
Discount %=36%

Substitute the values:

4200
MP
​
=
100−36
100+36
​

4200
MP
​
=
64
136
​

MP=4200×
64
136
​

MP=4200×
8
17
​

MP=525×17=8925
Thus, the marked price is ₹8,925.