The per cent profit made when an article is sold for Rs. 78 is twice as much as when it is sold for Rs. 69. The cost price of the article is

Let the cost price be x; the profit at a selling price of 78 is (78 minus x), and the profit at a selling price of 69 is (69 minus x). The problem states that (78 minus x) equals 2 times (69 minus x), so 78 minus x equals 138 minus 2x. Solving for x gives x equals 60.

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