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Question

By selling an item for Rs. 24, the shopkeeper earns the percentage profit equal to cost price of the item. Find the cost price.


A

120

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B

-120

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C

-20

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D

20

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Solution

The correct option is D

20


Let the cost price be x
Profit on the item is 24x

Profit % = S.PC.PC.P×100

=24xx×100

Given that the profit percentage is equal to the cost price.

24xx×100=x
x2=2400100x
x22400+100x=0
x2+120x20x2400=0
(x+120)(x20)=0
x=120 or 20

Cost price of an item cannot be negative.

So, the cost price is Rs. 20


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