$5$% more is gained by selling a watch for $Rs. 350$ than by selling it for $Rs. 340$. The cost price of the watch is

Let the cost price be x, where selling for 340 gives a certain gain and selling for 350 gives a 5% higher gain. The difference in profit is 350 - 340 = 10, so using the profit percentage formula, 5% of the cost price equals 10. Calculating x gives 0.05x = 10, so the cost price is Rs. 200.

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