It used to be 12 euros but I think it went up to 15. The track has been under threat of closure for a couple of years as Lidl want to build a supermarket on the site, but nothing has happened and, as far as I know, it will still be there this year. There is another track in Alcudia - at Bellevue, costs a bit more (20 I seem to remember), but the track is bigger.