Task: Question Answering
Input (English): Problem: a trader has 1600 kg of sugar . he sells a part at 8 % profit and the rest at 12 % profit . if he gains 11 % on the whole , find the quantity sold at 12 % ? 
Options: a ) 1000 , b ) 1200 , c ) 1400 , d ) 1450 , e ) 1500
Output (English): b