A shopkeeper marks up the price of the Toor dal by 20% and gives a discount of 10% to thecustomer. Besides, he also tricks 100 grams to his dealer and his customer respectively while buying orselling 1 kilogram of Toor dal. Find the profit percentage of the shopkeeper.

Let the cost of 1000gm of dal be rupees 1000

Now the shopkeeper is buying 1100 gm of dal for rupees 1000

While selling 900 gm of dal the shopkeeping is charging the price of 1000 gm

Therefore while selling 1100 gm of dal the shopkeeper will charge the price of (1000/900)*1100 gm = 11000/9 gm

He has marked up the price by 20% and then given a discount of 10%

So price charged by shopkeeper = (11000/9)*1.2*0.9 = 1320

So the shopkeeper is spending rupees 1000 to buy the dal and is selling the same quantity of dal at rupees 1320. Therefore, profit percentage is (320/1000)*100 = 32%