The selling price of one article after allowing a discount of 15% on its cost price, is the same as the selling price of another article after allowing a discount of 25% on its cost price. If the sum of the cost prices of both the articles is Rs. 640, then find the selling price of each article.

• A. Rs. 250
• B. Rs. 255
• C. Rs. 280
• D. Rs. 340