Final answer:
The statement is true; modern POS systems in hotels can post both cash and credit-card sales directly to a guest's folio in real-time when integrated with the hotel's PMS.
Step-by-step explanation:
The statement that if the hotel bar has a POS (Point of Sale system), both cash sales and credit-card sales made in the cocktail lounge appear immediately on the folios of the drinking guests is generally True. Modern POS systems are designed to integrate with the hotel’s property management system (PMS), allowing for a seamless transaction experience.
This means that when a guest at the cocktail lounge makes a purchase, the charge is directly posted to their room’s folio regardless of whether they pay by cash or credit card, provided they have been properly identified as a guest.