What you can learn form this is bring enough money, but most importantly is to now you integers for problems like this. i this worker did not know how to add integers then she might have been fired because this lay would have owed the company $20.
I came here to pay for my food.
can I help you?
I only have $20.00, Will you take my $20 so I only owe $20?
I guess you need to work off that $20 to pay off your debt. So you are at -20 right now, -20 + 20 = 0. Once you clean up, you would be at $0 and you wouldn't owe us anything. But do a good job. The longer you take the longer you wait.