cm0002@lemmy.world to Funny: Home of the Haha@lemmy.world · 15 days agoNew Mathlemmy.mlimagemessage-square62fedilinkarrow-up1651arrow-down18cross-posted to: [email protected]
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minus-squarephlegmy@sh.itjust.workslinkfedilinkarrow-up6arrow-down1·14 days agoHuh? We’re talking about percentages not multiplication. Where’d the 1.1 and .9 come from?
minus-squarebillwashere@lemmy.worldlinkfedilinkEnglisharrow-up1arrow-down1·edit-214 days agoIf you increase something by 10% you’re doing this: (10% • X) + X (.1 • X) + X 1.1 • X So you’re just multiplying the original value by 1.1. Similarly for subtracting 10% you’re multiplying by .9 So the order in which you add or subtract 10% doesn’t matter. You always get the same number.
minus-squareOstrakon@lemmy.worldlinkfedilinkarrow-up6·14 days agoI have 100 dollars. I lose 10% of it. I now have 90 dollars. Now I increase my 90 dollars by 10%. Is it your assertion that 10% of 90 is 10?
minus-squarebillwashere@lemmy.worldlinkfedilinkEnglisharrow-up1·14 days agoNo. Because increasing 90 by 10% is: 90 • 1.1 = 99 Percentage is relative to current value, not previous calculations. 10% of 90 is 9.
Huh? We’re talking about percentages not multiplication. Where’d the 1.1 and .9 come from?
If you increase something by 10% you’re doing this:
(10% • X) + X
(.1 • X) + X
1.1 • X
So you’re just multiplying the original value by 1.1. Similarly for subtracting 10% you’re multiplying by .9
So the order in which you add or subtract 10% doesn’t matter. You always get the same number.
I have 100 dollars. I lose 10% of it. I now have 90 dollars. Now I increase my 90 dollars by 10%. Is it your assertion that 10% of 90 is 10?
No. Because increasing 90 by 10% is:
90 • 1.1 = 99
Percentage is relative to current value, not previous calculations. 10% of 90 is 9.