[lesuorac]

I mean there's a bunch of why's. The real world is pretty imperfect.

But anyways, if you add the item to your cart when it's say $1.40 and it becomes $4.40 by the time you get to the register that seems double-non-plus.

[randomcarbloke]

this example is trivially solvable

[BehindBlueEyes]

doesn't sound trivial to me, could you give me examples how?