Task: Question Answering
Input (English): Problem: a furniture store owner decided to drop the price of her recliners by 20 % to spur business . by the end of the week she had sold 40 % more recliners . what is the percentage increase of the gross ? 
Options: a ) 10 % , b ) 15 % , c ) 11.2 % , d ) 7 % , e ) 13 %
Output (English): c