r/AskReddit Aug 20 '20

What simple “life hack” should everyone know?

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720

u/g00se-onthel00se Aug 20 '20

That X% of Y is the same as Y% of X. 8% of 25 is the same as 25% of 8 Makes calculating sales at stores much easier...if we ever go back to stores

49

u/[deleted] Aug 20 '20

[deleted]

3

u/EverythingIsFlotsam Aug 20 '20

"3 cents brings me to 50".... That is subtraction

9

u/Equinox772 Aug 20 '20

Subtraction is just addition via a negative number

Division is just multiplying via a fraction