The marked price of a chair is 40% more than its cost price. If the chair is sold for Rs 520 after a discount of Rs 40, then what will be the profit percentage?
Let cost price = Rs. $$100x$$
=> Marked price = $$100x+(\frac{40}{100}\times100x)=Rs.$$ $$140x$$
Selling price = Rs. 520
=> Discount amount = $$140x-520=40$$
=> $$140x=40+520=560$$
=> $$x=\frac{560}{140}=4$$
Thus, cost price = $$100\times4=Rs.$$ $$400$$
$$\therefore$$ Profit % = $$\frac{(520-400)}{400}\times100$$
= $$\frac{120}{4}=30\%$$
=> Ans - (D)
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