The customer does not think like us. Do not think like the system or how the programming code.
The customer searches for 1 apartment for 4 adults. The system should automatically understand that the price for 4 persons must be different from the price of 2 people. Automatically though. It must not be an extra.
Look at the screenshot of booking.com that I sent you shortly ago. Can you also include this in the next update? It is fundamental.