Task: Question Answering
Input (English): Problem: the sale price of an article including the sales tax is rs . 616 . the rate of sales tax is 10 % . if the shopkeeper has made a profit of 16 % , then the cost price of the article is : 
Options: a ) 500 , b ) 334 , c ) 531 , d ) 664 , e ) 5598
Output (English): c