New cash register shock!

Our local corner-shop, M Sakib General Stores has got a new cash register. The old one is forty-five years old, and he’s probably been using it since it was new. He decided he had to retire it after customers mentioned that the balance shown on the front of the till was wrong (even though on his side it is correct). He hasn’t quite migrated to the “new” model yet, though; it’s 80’s technology and he hasn’t quite figured it out yet.