A shopkeeper earns 20% by allowing a discount of 10% on the marked price of an article. An article is marked at Rs. 280, its actual price is
Let the cost of the article be x Rs.
Selling price = 1.2 x
But 1.2 x = 280 * .9
So, x = 280 * .9/1.2 = 210 Rs.
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