Book Maths Puzzle Numerical Ability Profit and Loss

By seeling a sofa set for Rs. 4,500 a shopkeeper loses 10%. For how much should he sell the sofa set so as to gain 10%?

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Book Other Question

6ab^2-35xyz^2+44x^2=? Find the persent of pure gold in 22-carat gold, if 24-carat gold is cent per cent pure gold.