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So wise. (media.piefed.world)
submitted 4 months ago by to c/lemmyshitpost@lemmy.world
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So wise.
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[–] 14 points 4 months ago* (last edited 4 months ago) (1 child)

Another counter-intuitive percentage fact: A 10 percent discount and a 10 percent fee can be calculated in either order but they don't cancel out.

Example, 90% of (110% of 10) = 110% of (90% of 10). But neither of those is evaluates to 10. They evaluate to 9.9.

For any percentage X, and any base value C, (100 - X)% x ((100 + X)% x C) = (100 + X)% x ((100 - X)% x C) = (100 - (X^2/100))% x C

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