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** Q 2315756660. ** A person sells a Transistor at a gain of 16.67% and a Headphone at a loss of 15% but on the whole he gains Rs. 280. But if he sells the Headphone at a gain of 20% and the Transistors at a loss of 6.67 % then there is no loss and no gain. Find the cost price of the Headphone?

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