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 . 400 . find the total worth of the stock ? 
Options: a ) 15500 , b ) 16000 , c ) 15000 , d ) 17000 , e ) 20000
Output (English): c