The order of numbers in percentage calculations does not affect the result, meaning that 'a% of b' always equals 'b% of a' because the percent sign acts as a commutative operator; for example, 18% of 50 equals 50% of 18 (both equal 9), and 40% of 70 equals 70% of 40 (both equal 28).
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Deep Dive
Your Brain Lied to You About Percentages
Added:Quick, what's 18% of 50?
Yeah, your brain just blue screened. I watched it happen. Flip it, cowboy. 18% of 50 is the exact same as 50% of 18.
And 50% is just half. Half of 18? Nine.
You didn't need a calculator. You needed a hug and some confidence. This ain't a coincidence, partner. 40% of 70 equals 70% of 40. Both 28. The percent sign is a switcheroo. It does not care which side it bats from. So, some smug fellow goes, "What's 4% of 75?" You don't panic. You flip it. 75% of 4, that's three. Now, he's the one sweating. Rule simple. Pick the easy half. Flip the ugly one. Congratulations. You're now smarter than you were 40 seconds ago.
Which, let's be honest, wasn't hard.
Now, go terrorize a waiter with your tip math. Yeehaw!
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