The shoe clerk took the $50.00 next door to get change and got $50.00 back all even at this time....
The clerk gave the woman the shoes and $20.00 back in change and he got $30.00 to the good in register....
Now he has the give the clerk next door $50.00 back to cover the bad bill.....
This makes the shoe clerk out the $50.00 plus the $20.00 in change but he made $30.00 on the sale
so he is still $10.00 to the good on the sale.
Now he has a counterfeit $50.00 bill that no good.
In all the shoe clerk is out $90.00.