A person sold a watch at a profit of 10%. If he had sold

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A person sold a watch at a profit of 10%. If he had sold it for ₹ 2000 more, he would have gained 20%. Find the CP of watch ?

Here, a = 10% , b = 20% , r = 2000
According to the formula
CP of watch = [r/(b - a)] x 100 = [2000/(20 - 10)] x 100
= (2000 x 100)/10
= ₹ 20000