A trader has a weighing scale that shows 1200 gram for a kilogram. He further marks up his cost price by 10%. Then the net profit percentage is:

Let the cost price of 1000 grams be Rs. 1000,

The weighing scale shows 1200 grams for 1000 grams which means he sells 1000 gms at a cost price of 1200 gms.

He will get Rs. 1200 for selling 1000 grams.

It is given that he further marks up his cost by 10%, he is selling 1000 gms at 1200*(1.1), i.e. Rs 1320

Therefore, the net profit percentage = $$\frac{1320-1000\ }{1000}\times100$$ = 32%

The answer is option B.