how do i know how much i will be billed and when??

Hello
I subscribed for avast cleanup yesterday, trial version. I think i swa i would be billed 19.99€ after 30 days, but i see different pricing on avast site. When i go on my account, i can’t figure out when and how much i will be billed. Please tell me how to do so, and think of making this more obvious for your other customers.
François