Task: Question Answering
Input (English): Problem: a trader marked the selling price of an article at 11 % above the cost price . at the time of selling , he allows certain discount and suffers a loss of 1 % . he allowed a discount of : 
Options: a ) 10 % , b ) 10.5 % , c ) 9.9 % , d ) 12.5 % , e ) none
Output (English): c