Task: Question Answering
Input (English): Problem: a trader cheats both his supplier and customer by using faulty weights . when he buys from the supplier , he takes 10 % more than the indicated weight . when he sells to his customer , he gives the customer a weight such that 10 % of that is added to the weight , the weight claimed by the trader is obtained . if he charges the cost price of the weight that he claims , find his profit percentage . 
Options: a ) 20 % , b ) 21 % , c ) 21.33 % , d ) 22.109 % , e ) 23 %
Output (English): b