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A sells an article to B at a profit of 10% B sells the article back to A at a loss of 10%. In this transaction:

A. A neither losses nor gains B. A makes a profit of 11% C. A makes a profit of 20% D. B loses 20% Answer: Option B
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Solution(By Apex Team)

First Method Let CP was 100 for A originally A sells article to B at 10% profit, CP for B = 100 + 10% of 100 = 110 Now, B sells it A again with loss 10% Now, CP for A this time = 110 – 10% of 110 = 99 A makes Profit = 110 – 99 = 11 %profit for A = $\frac{11 \times 100}{100}$= 11% Second Method It could be easily shown by net percentage change graphic. 100(A) == 10%(Profit) ⇒110(B) == 10%(Loss) ⇒ 99(A) In this transaction A makes a profit of (110 – 99 = 11%) 11% [10% on selling to B and 1% profit on buying back from B]

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