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Why if you start out with number 100 increase it by 25 percent then decrease it by 20 percent and now your back to 100 again Why?
Wiki User
∙ 11y ago
If you begin with 100 and increase it by 25%, predictably, you end up with 125. But when you decrease it by 20%, we're talking about 20% of the latest result, not of the original number. 20% of 125 is (125)*(0.2) = 25. So 125 - 25 brings you back to 100.
You cannot simplify or total the change in percent before calculating, because we're not always talking about the percent of the same number.
Wiki User
∙ 11y ago
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As evidence by Saki's story The Interlopers an author can?
build suspense, have it decrease in the middle of the story, and have it build again. ~APEX approved~
