Cash Register Problem not understood

Cash Register Problem not understood
0

#1

Please I need explanation on how the cash register problem actually works. I’ve looked at the instructions and some of the test cases but I can’t get my head around them.
Thanks in advance.
Here is the challenge link Cash Register


#2

Can you be a little more specific about which part of the instructions you do not understand?


#3

I’ve not understood how to calculate the change and what the numbers (eg [‘ONE’, 50]) means.


#4

That means there are 50 ONEs.