Task: Question Answering
Input (English): Problem: from the sale of sleeping bags , a retailer made a gross profit of 13 % of the wholesale cost . if each sleeping bag was sold for $ 28 , what was the wholesale cost per bag ? 
Options: a ) 3.0 , b ) 3.36 , c ) 24.78 , d ) 25.0 , e ) 31.36
Output (English): c