The cost of an article is first increased by 20% and then decreased by find the percentage change in the cost of the articles
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increase in price is 20% hence new price is 20% of 100
=20 so new price would be 100+20=120.
Afterward there is a decrease of 30 % in price from 120 rs,
hence 30% of 120 is 36
so new price would be 120–36 = 84.
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