It'll be pretty easy to sort out. Chances are, you'll have a till and that'll do the addition for you. I work in a shop on campus and it's fairly easy because of that - though most things aren't priced and you either check the price by walking to the item or hollar at someone across the store who guesses or actually knows the price (who knows if half the stuff we sell is priced correctly!) and everyone doesn't really care and is patient, even if you've asked about the same item about twenty times because the price just isn't going in! After a few weeks, the prices will come to you and you'll remember them easier - if you do, indeed, need to do pricing like that. You'll remember them whether you do or don't, to be honest.
I'd just relax. If you get the job then they've obviously seen something good in you and will be happy to show you the ropes and allow you to settle in.
I hope seeing your tutor goes well. Just take it easy with the panicking!
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