For Gas station with convenience store design an internal control system including flow charts with designated staffing and a narrative to cover normal cash receipt or credit card operations and exceptions that would most likely occur in that industry (for example reimburse cash for returned goods). You may address just one specific operation in the cash receipts if you want to. For example, poker tables in a casino. Include in your narrative how a failure in your system might occur. You may use an actual company or describe a hypothetical one that would be reasonably expected to operate like your description.