How does a change machine work?

Answer by  Rosebud (334)

A change machine reads the magnetic ink that is printed on each paper bill. As for change, the size of the coin is determines where it goes.

Answer by  nerd56 (128)

Change machines work by using lasers to scan paper money. There are certain places that will reflect light on each type of bill, this is how the machine determines what amount of money you put in. To give change out the machine measures the size and weight of each coin being dispensed.