Math and percentages

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Sorry but stuck on stupid on this one.

If I have a random number – let’s say 545 and I reduce it by 20%. It’s reduced by 109 making it 436.

But if I want to increase it back to 545 I have to add 25%

Edit: Ahhhh Thank you all for this! Makes perfect sense now!

In: Mathematics

11 Answers

Anonymous 0 Comments

We can use different and easier numbers to visualize it.

If we have 100 something and decrease it by 50%, it’s the same as

100 * 0,5 = 50

100 – 50 = 50

100 / 2 = 50

But if we take the 50 something and increase it by 50%, it’s the same as

50 * 1,5 = 75

50 + 25 = 75

50 / 0,6666… = 75

Different starting points have different weights in percentage

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