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# If the cost price of 20 articles......

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If the cost price of 20 articles...... [#permalink]  19 Oct 2010, 04:33
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Difficulty:

(N/A)

Question Stats:

38% (00:00) correct 63% (00:27) wrong based on 5 sessions
If the cost price of 20 articles is equal to the selling price of 25 articles, what is the % profit or loss made by the merchant?

A. 25% loss
B. 25% profit
C. 20% loss
D. 20% profit
E. 5% profit
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Re: If the cost price of 20 articles...... [#permalink]  19 Oct 2010, 05:43
Let the cost price of 1 article be $1. Therefore, cost price of 20 articles = 20 * 1 =$20

The selling price of 25 articles = cost price of 20 articles = $20. Now, we know the selling price of 25 articles. Let us find the cost price of 25 articles. Cost price of 25 articles = 25 * 1 =$25.

Therefore, profit made on sale of 25 articles = Selling price of 25 articles - cost price of 25 articles

= 20 - 25 = -$5. As the profit is in the negative, the merchant has made a loss of$5.

Therefore, % loss = loss/cp * 100
% loss = -5/25 * 100 = 20% loss.
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Re: If the cost price of 20 articles...... [#permalink]  19 Oct 2010, 06:18
Expert's post
Let cost price of one article be c and selling price of one article be s.
We need to find profit/loss% which is equal to ((s-c)/c) x 100 = (s/c - 1) x 100

Given that 20c = 25s. Then s/c = 4/5
Profit% = (4/5 - 1) x 100 = -20%

Note: It is preferable to use as few variables as possible but in situations where cp of n articles = sp of m articles, it is better to use different variables for clarity.
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Last edited by VeritasPrepKarishma on 19 Oct 2010, 10:30, edited 1 time in total.
Manager
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Re: If the cost price of 20 articles...... [#permalink]  19 Oct 2010, 09:30
it's 20% loss - C.. OA pls
Re: If the cost price of 20 articles......   [#permalink] 19 Oct 2010, 09:30
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