Yang botched it by chaining
=wrong.100 − 10 = 90 + 9 = 99
❌ cringe
100 − 10 = 90
90 + 9 = 99✔️ based
Don’t they teach math in the US anymore? Or do you get a pass on basic subjects if you are on the football team?
Yeah he totally cooked Yang. That guy has NO IDEA where the 9 came from.
Just noticed if you also decrease something by 10%, then increase by 10%, you also get a net loss of 1. Math itself is biased towards loss.
Anyone convinced in the malevolent creator theory yet?
Increase by 10 then decrease by 10. Same problem. Math is lossy.
Adding flat numbers is different from adding a percent.
Both sides are right in a way. It just depends on what you’re comparing the +/-10% to
Percent increase/decrease is
change/original.This is clearly about the US stock market crashing. In that case it’s always the days gain/loss, in which case Yang is the only person who is right.
This is important because a lot of people saw “down 10%” and now “up 10%” without realizing that’s still day over day loss.
That is the difference between percent and percentage points.
TBF Yang really did write the equation in the sloppiest way possible.
Like I know what he MEANS but no math professor in the world would let this shit slide.
Yeah if you put it:
100 - (100 x 0,1) = 90
90 + (90 x 0,1) = 99
It comes quite obvious. And I know the brackets are redundant, but my coder mind forces brackets to all math formulas for readability.
Was it on purpose, maybe.
Decimal commas ain’t 'merican: you’d totally throw them with your weird euro math.
Even
100 - 10% = 90
90 + 10% = 99
Works better than what he did, because that’s how you’d enter it on a standard calculator.
100 - 10/100 ≠ 90
I’m not a fan of this at all and wish people would treat percentages as if they were a unit. x% is x of y per 100 total.
x% = x yi / 100 ytotal
Where yi is the species in question.
My cup is 90% full: My cup contains 90 unitswater / per 100 unitscup
This is why I don’t like Baker’s percentages. I guess it makes sense, because it’s still per cent, but they’re mixing the meaning used practically everywhere else these days.
50% water for baking isn’t 50 unitswater / per 100 unitsdough, it’s 50 unitswater / per 100 units**flour**. In my mind that means you have 33.33% hydration, not 50%…
Just feels weird to not express that as a ratio. But I guess it’s a shorthand that works for them :/
Yes I understand all that but I’m telling you standard calculators literally work that way.
Just launch the calculator app on your phone or computer and give it a try, you’ll see.
This is very upsetting
Thanks for the heads-up. I would have been happier never knowing haha
The implied brackets. THE IMPLIED BRACKETS!! The horror.
Thanks for the response kind soul
No worries. Yeah I get that it’s a bit weird if you know how to do it properly but it’s actually a fairly helpful trick for quickly calculating discounts, which I assume is the indented use. Remember, calculators were designed for lazy business folks who suck at math.
This is exactly how someone who failed HS math would think about the problem, and conveniently, it just works.
Um you can type like that into a calculator? Any answers please specify an actual calculator vs computer.
Sure can.
And yes I was stunned as well when I learned it, because that’s not how it’s taught in schools. I used to do exactly what the previous commenter did, and then one day I saw some illiterate mouthbreather type it in like that and I was like “nuh-uh, that’s not how that works, gimme that thing and let me show you.” And I typed it in the long and “correct” way, and whaddayaknow? Same result.
But it makes sense when you think about it, calculators were literally invented for business use (and most business people are notoriously bad at math), and one of the most common uses in business is figuring out how much something should cost after applying a discount.
Like an actual calculator or one on the computer?
It works on both. I tried the calculator apps on iOS and Windows and they both worked that way. And if you still have a regular old digital calculator, it should work on that too.
Most of the ones I’ve used work that way.
An actual calculator or a computer?
Both? The cheap simple calculators I used decades ago would work if I typed
1then0then0then-then1then0then. Granted, I have experience with maybe 3 calculators in my life, so I might have just gotten lucky.
I think of it as
100 x 0.9 = 90
90 x 1.1 = 99
Am I the odd one out?
Percentages for show, decimals for a pro
Shameless plug for Engineering Memes community ported during the great API migration: [email protected]
100(1-0.1)=90
90(1+0.1)=99
Yes.
But also, Barqs does have bite.
Readability is important. I do the same thing, because just because something is technically correct doesn’t mean there isn’t a better way to do it. I’m very pro-bracket.
It’s twitter, why’d anyone put effort in what they write.
That’s what makes it great bait
Yeah, for idiots
Some bureaucrats in Mexico City tried this years ago.
An important ring road had two lanes in each direction. To increase its capacity, they didn’t actually widen the road; they just repainted the lane markings to turn two lanes into three, and claimed a 50% capacity increase!
Everyone immediately screamed about being crammed together just centimetres apart, accidents increased and the city officials quickly u-turned; they repainted to have just 2 lanes in each direction again.
But they then tried to claim that as that was a 33% decrease, and that because they had earlier increased it 50%, that meant they had achieved a net 17% increase in the road’s capacity!
I have seen this or a variation of this too many times now, saving this for my own meme responses, its too fucking useful.
Not even close to that anyway, the dow jones for example went from 44k to 37k back up to 40k. Still hasn’t even regained half the value it lost.
Brought to you by the same people that can’t explain tides
yeah they think the MOON does it lmfao, everyone knows it’s the CIA’s totally epic wave machine for selling more surfboards 🌊🏄♀️🐟
Tide comes in, tide goes out. You can’t explain it!
For anyone who doesn’t get the reference, here you go
Bread goes in. Toast comes out. It’s a mystery!
Magnets, how do they work?
Nobody knows! Like how you can only see the effects of the wind, but can’t see or explain it.
That knowledge is probably locked away in the 90% of our brain we don’t use.
Ah yes I hate those
And hate windmills
At least they keep the turtles cool
Windmills do not work that way! Good night! 😂
Any respectable man of science will tell you that due to thermodynamics, the windmills actually result in a net heating effect
I might as well throw the same comment in here. You learn this pretty quickly when you bet on meme stocks. Down 90% then up 100% I can assure you, you are no where near where you started.
Same with crypto. You’ll get a notification something went down 10%, then up again 10%, but if you zoom out you see it’s just been slowly going down on average since the last huge spike.
I thought this was c/funny not c/deeplyconcerning
pegglegg back in fifth grade: ‘why i need to learn this math stuff. i aint never gunna use it’
It’s not that you will regularly have a calculator in your pocket
Checkmate
you still need to know what buttons to push on the magic box, and in what order…
And how long to push them.
Yeah the “checkmate” was supposed to signify that irony
“It’s not like you’ll regularly have a little box in your pocket with access to the sum of all of the knowledge in the world but you’ll have to sift through an equal amount of incorrect knowledge and have the ability to differentiate the two.”
That kind of math didn’t start for me until letters started showing up in it. This is basic shit though!
It’s only the same if it’s up 10% compared to the original number. It all depends on your time period, you could be up 30% compared to 7 years ago.
Tesla stock prices are good example of this. They are down ~50% since december and up ~70% since lowest point in april last year.
