
Arturo O. answered 09/24/16
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Take the ratio of the new number to the old number, subtract 1 from the ratio, and multiply the result by 100. That is the percent change:
Percent change = 100 [(2.4 / 1.8) - 1] ≅ 33.3%
Since the final result is positive, it is an increase of 33.3%.