Question
A merchant made a profit of Rs. 600 on selling a gadget.
Had the cost price been Rs. 400 lower and the selling price Rs. 900 more, the profit would have been 100%. What was the original selling price?Solution
ATQ,
Let the original cost price be Rs. x.
Original selling price = x + 600
New cost price = x - 400
New selling price = x + 1500
So,
2(x - 400) = x + 1500
⇒ 2x - 800 = x + 1500
⇒ x = 2300
Original selling price = x + 600 = Rs. 2900
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