Answer:
The employees will not enter the sale in the system thus, making the entire revenue for themselves. The system will not reocrd the sale thus, it will not be in the cash blanace once the restaurant close it. The cashier will took the extra money. They can make a deal with the waitress to share the profit so It doesn't complain about receiving the receipt Or explain the customer it has to pay in cash as the system for credit card is failling.
In the end, making sure each customer receives a receipts will mean it was loaded in the system and thus, avoiding ghost tables.
Internal control measurement:
The manager, should make a random control for the cashier and for the tables to look if they match the customer and the tables used.
It should also start looking for how much is the average ticket and the ticket
It should also talk with the cooking employees how much dinners they prepare, how much bussy was the night or directly apply a production bonus thus, they will be incentive to keep track of the meals cooked.
Explanation: