An article when sold at a gain of 5% yields Rs. 15 more than when it is sold at a loss of 5%. Then, the cost price of that article (in Rs.) is

The difference between a 5 percent profit and a 5 percent loss on the cost price is 10 percent of the cost price. Using the given difference of Rs. 15, we set up the equation 10 percent of the cost price equals 15. Solving this gives a cost price of Rs. 150.

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