The cost of an article is first increased by 20% and then decreased by 30%, find the percentage change in the cost of the article.
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Let the original price be x
Then increased to 20%⟹x+10020x=56x
Then decreased to 30%⟹56x−10030×56x=2521x
So the net decrease is x−2521x=254x
The percentage change is x254x×100=16%
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