The following question is accompanied by two statements (I) and (II). You have to determine which statement(s) is/are sufficient/necessary to answer the questions.

The cost price of an article is Rs. 100. What is the percentage profit earned by the merchant on selling the article?

I: The marked price of the article was 140% of the cost price. 

II: A discount of 21% on the marked price was given on the article.