72 is 20% less than 90.
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The percent of decrease means "what is the percentage decrease from a larger number to a smaller number?" For example: What is the percentage decrease from 90 to 72? Solution: (90 - 72) / 90 = % 18 / 90 = 1 / 5 = .2 = 20% Check: 90 * .2 = 18 90 - 18 = 72 = true!
90
(72 - 64)/72 x 100 = 11.1 recurring (that is, 11.1111...) percent.
9.09% decrease.
45 is 37.5% smaller than 72.