A shopkeeper marked 50% more price than cost price of the

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A shopkeeper marked 50% more price than cost price of the article . If he allows 30% discount to his customers, then his profit per cent is

Here, r = 50% and r₁ = 30%
∴ Gain per cent = [r(100 - r₁)/100] - r₁
= [50 x (100 - 30)/100] - 30
= 35 - 30 = 5%