Task: Question Answering
Input (English): Problem: mohit sold an article for $ 21000 . had he offered a discount of 10 % on the selling price , he would have earned a profit of 8 % . what is the cost price of the article ? 
Options: a ) 16000 , b ) 25000 , c ) 15000 , d ) 18000 , e ) 17500
Output (English): e