Mildly Interesting

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This is for strictly mildly interesting material. If it's too interesting, it doesn't belong. If it's not interesting, it doesn't belong.

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My Grocery shopping was exactly $40.00 (pawb.social)

submitted 8 months ago by [email protected] to c/[email protected]

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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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[–] [email protected] 7 points 8 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.

[–] [email protected] 3 points 8 months ago* (last edited 8 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

[–] [email protected] 7 points 8 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.