How did he know that he ate instant noodles in the hotel?

You asked about the instant noodles in the hotel. How did he know that there was a charge for eating them? It's on the hotel meter.

According to today's headline query, the hotel needs to charge for instant noodles, and all the charging items in the room are listed for viewing.

Hotels, also known as hotels, hotels, inns, guest houses, business trips, inns and inns, are places where guests stay and eat.