this post was submitted on 23 Feb 2024
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Mildly Interesting

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I didn't have a budget or anything so I found it mildly interesting that it turned out an even number.

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[–] colourlesspony@pawb.social 7 points 10 months ago (2 children)

I was wondering the same thing. I was trying to buy exactly 10 items because that's the max they allow at the self check out now. I'm wondering if that increase the odds greatly or something.

[–] sqibkw@lemmy.world 7 points 10 months ago

Buying 10 items would definitely make this way more likely, because we have a base-10 counting system.

To simplify the problem, if you look at the cents digit, $0.09×10 items = $0.90. If you look at both cents digits, they were mostly $0.99. $0.99×10 items = $9.90.

All you'd need in either case there is something to cost $0.10 more to get a nice even number.

[–] wewbull@feddit.uk 3 points 10 months ago* (last edited 10 months ago)

If all the prices are $x.x9 then it's only possible if you buy a multiple of 10 items.

  • 1 item will send with a 9
  • 2 items will end with an 8
  • 3 items will end with a 7

...

  • 9 items will end with a 1
  • 10 items will end with a 0