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Suppose a 90 dollar item was on sale for 72 dollars. What is the percentage change? Find the difference. 90 - 72 = 18. 18 is 1/5 of 90 or 20%. The percentage of decrease is 20%. Since we subtracted 20% from the original number, the remainder must be 80%. 72 is 80% of 90. (90 x 0.80 = 72)

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โˆ™ 2012-03-17 22:36:29
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