Price to list ad

OK, I don't have to admit, it is obvious, but I'm a newbie here.

Is the price then 2% to list the ad, plus $4?  And it doesn't matter if it sells or not?

Or is the price $4 to list the ad, then 2% of the sale price?

I didn't see any specific FAQ section about fees, but maybe I wasn't looking in the right place.

OK, as a follow-up, now I know why I thought the fees were 10% here.

One time I had asked about an item, and even made a relatively close offer, telling them I was a newbie to Audiogon, and the person wrote back saying the fees would be 10%, and so I should get a bit closer to the price they were asking.

So now I'm glad I didn't.  It apparently didn't end up selling, even though they said somebody else was buying it the next day when they got paid, unless I increased my offer right then.