I can’t forget the method of counting numbers before with the use of abacus. Although I don’t know how it works but I’m sure it made things easier for them, at least on those times. But now, I cannot imagine what would happen if cashiers are still using it in the grocery stores. And as the world advances, so does the calculating tools in performing arithmetic procedure hence, you’ll see retail cash register systems at every check-out counters. It can handle multiple applications at a given time with relative ease. It does not only bring comfort in your shopping time but it also make things a lot easier for everyone.