Aditya sold two bags for Rs. 630 each. On one bag he gains 33% and on the other he losses 33%. Find his gain or loss per cent on the whole transaction.

Correct option is C

When two different articles are sold at the same selling price getting a gain of x% on the first and a loss of x% on the second. Then,
Overall percentage loss in the transaction = (x²/100)% = 33²/100 = 10.89% loss