You gotta tip here so as a guide, Wait staff get 15-20% of the bill, cabs 15%, barstaff $1 a round, hairdressers 10-15%, hotel doormen $1 for hailing a cab, hotel porters $1 a case and Take a Way delivery around $2.
Quickest way to work out the tip in restaurants is to take the sales tax ( 8% ) and double it.