Tips & Tricks Let cost price of an article be Rs. A Profit percentage = 10% = loss percentage Then, ⇒ 10 = [(A - S.P)/A] × 100 ⇒ A = 10A - 10S.P ⇒ S.P = 9A/10 Selling price of an article = Rs. 270 Given, ⇒ 9A/10 = 270 ⇒ A = 300 ∴ Cost price of an article is Rs. 300.