Answer:
A Vietnamese restaurant in Australia always pays its employees in cash.
Step-by-step explanation:
This transaction would not require the exchange of currency, because even if the Vietnamese restaurant serves Vietnamese food, and is likely to be owned by Vietnamese nationals, the restaurant itself is located on Australian territory, and its employees, whether australian citizens or not, have to be paid in Australian currency.
Besides, the whole operation of the Vietnamese restaurant is in Australia, so its financing, product procurement, and operation in general, is also carried out in Australian currency.