Task: Question Answering
Input (English): Problem: when sold at a 50 % discount , a sweater nets the merchant a 40 % profit on the wholesale cost at which he initially purchased the item . by what % is the sweater marked up from wholesale at its normal retail price ? 
Options: a ) 20 % , b ) 64.29 % , c ) 70 % , d ) 80 % , e ) 100 %
Output (English): b