New Host - How Airbnb charge me on my listing

[Roomy0]

Hi there, i'am new in airbnb as a host. Is there any one can tell me how airbnb deduct the service charges of my listed price?

I putting 99 / nite stay, and guest have booked for 2 days.

but payout from airbnb is 97 x 2 days = 195, & addition airbnb service fee of 8, just want to know what is the rate they charges to the host?