Task: Question Answering
Input (English): Problem: a shopkeeper sells 20 % of his stock at 20 % profit ans sells the remaining at a loss of 10 % . he incurred an overall loss of rs . 500 . find the total worth of the stock ? 
Options: a ) 13500 , b ) 12000 , c ) 12500 , d ) 15000 , e ) 15500
Output (English): c