Do barristas really also get paid sub-minimum wage?  I didn't realize... I'm not in the habit of going to cafes, but when I do I usually just get a drinnk and something out of a case, so I never tipped.

I tip 18% at restuarants, because 18%tip+7%tax=25%, which is easy as long as they show the pre-tax total.

I've only paid for myself at a hairdresser twice, so no idea (probably 15-20%), and taxis are 15%.