By selling an article for ₹600, a shopkeeper makes a profit of 20%. At what price should he sell the article to incur a loss of 20% ?

₹400

Selling price of the article = 600

Profit = 20%

and he wants a loss of = 20%

So, 

120% of CP = 600

Then 100% of the CP = \(\frac{600}{120}\) × 100 = 500

Selling price of the article at 20% loss = 80% of CP

= 80% of 500 = 400