@Christopher-John8 It is not possible for us to see how the charges break down as only you can see this. The Airbnb charge will be 15.5%+VAT so 18.6% in Scotland assuming you have the same 20% VAT rate as England!
If you set a price of £100 then you will be charged 18.6% of this and you will actually receive £81.4.
Do you have any cleaning or other fees that are added to your nightly rates?
Best advice I can give is a) Keep playing with your rates which should tell you how much you will receive but then go on as a guest to Airbnb.com and simulate a booking (obviously don't pay) to see if what the guest is charged makes sense.