@Arline1,
I do not agree on both items.
Item 1: Never missed such feature and only slows down the system and/or brings up annoying suggestions. Maybe there are some spelling mistakes in this posting either, i don't care.
item 2: Airbnb service fee is not a percentage fixed per night, it depends also on length of stay.
If you sent special offer, you can see (dynamically) what guest pay in total when adjusting your price, so facility allready excists. You can also simulate a booking on your own listing to see what guests are offered, including cleaning fee (if any) or (tourist)taxes (if any)
Best regards, Emiel