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Let the cost price and marked price of the article be Rs. 7x and Rs. 12x, respectively Therefore, selling price of the article = 1.5 × 7x = Rs. 10.5x According to the question, 12x – 10.5x = 540 Or, x = 540/1.5 = 360 Therefore, amount by which article is marked up above its cost price = 12x – 7x = 5x = Rs. 1800
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