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Not quite in the USA you buy three items that end in 99c, but two of them have state sales tax, one of those has local sales tax and the other has a liquor tax.

SO you can work out the change IF you know the random extra amount that will be added at the checkout

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I've actually started using $2 bills for this reason.

This actually makes the non-uniformity worse, not better -- things priced at an even number of dollars don't factor into the calculation before tax (and there are lots of those), but after, change amounts get disproportionately weighted to the amounts of change produced by even numbers of dollars. Argh.

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