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 20 % , then the cost price of the article is : 
Options: a ) 500 , b ) 277 , c ) 466.7 , d ) 297 , e ) 111
Output (English): c