I'm a cashier and count change back the right way (old school) and they stand there and look at me funny or tell me I gave them too much so I start over it was 18.00 from 50 so 19 -20 etc. . the young and some old look at me funny but computers make mistakes too. not just me........ oh and after they enter the amount do not give them the change you'll be there a while teaching them what is the right amount to give you lol