The marked price of an article is Rs. 5000. It is sold for Rs. 3440.8, after offering three successive discounts of 15%, 12% and x%. If a single discount of 2x% is given on the marked price, then the difference between the new selling price and the old selling price (in Rs.) of the article will be:
1
622.9
2
836.5
3
759.2
4
852.6