*3!4!/5! wrote:If yesterday was 11% more than today, then you need today to be 10% less than tomorrow to recover.

If yesterday was 25% more than today, then you need today to be 20% less than tomorrow to recover.

If yesterday was 43% more than today, then you need today to be 30% less than tomorrow to recover.

If yesterday was 67% more than today, then you need today to be 40% less than tomorrow to recover.

If yesterday was 100% more than today, then you need today to be 50% less than tomorrow to recover. (That's right, if you have lost an amount equalling all of the money you now have left, then you'll only need to gain an amount equalling half of the money you'll end up with, to get back to even.)

If yesterday was 9999~~~9900% more than today, then you need today to be 99.99~~~99% less than tomorrow to recover (where 9999~~~99 denotes a string of N 9s for any given number N).

I hope I am succeeding in reinforcing the math and demolishing the myth.

This is the converse of Peter Foley's comment, but I the wording is very confusing to me. Is there a way to phrase it better?

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Repeating the wiki article links from page 1:

Second version is here: User:LadyGeek/Percentage gain and loss

First version is here: Percentage gain and loss