A shopkeeper claims to sell his articles at 20 per kg which cost him 23 per kg. But while selling, he uses a false weight and gives only 800 gm

A shopkeeper claims to sell his articles at 20 per kg which cost him 23 per kg. But while selling, he uses a false weight and gives only 800 gm instead of 1 kg. What is his profit percentage?

Sol:

Shopkeeper claims to sell at Rs. 20 per kg, 

He buys it for Rs. 23 per kg  Actual weight he sells at Rs. 20 is 800g. 

Calculations: 

⇒ Selling price of 800 gm article = Rs. 20 

∴ Selling price of 1 kg article = 20 × (1000/800) = Rs. 25 

⇒ Cost price of 1 kg article = Rs 23