Ripped off by one cent?

Today I got cash out via EFTPOS at a shop in Geelong. I asked for $100 in cash, which I received. It wasn’t until afterwards that it dawned on me that the amount that I had authorised was $100.01. So, where does the one cent go? Obviously not to me, and probably to the shop which was assuming I wouldn’t notice. I didn’t mention anything at the time – but I want to know whether this is standard practice or just a typo by the woman processing the transaction? Surely one cent is not worth it, but over hundreds or even thousands of transactions? Has anyone been diddled like this?