How to tip properly?

“Tipping”is always a difficult business.You do notwant to give too much or too little,or tip the wrong person. In Britain or America,people usually tip waiters inrestaurants,porters,taxi dirvers and hairdressers.They denot tip people in offices,cinemas,garages,or airports. Do you invite your friends to the restaurant?Then youpay the bill,Does your friend invite you?Yeur friendpays.If there are men and women in the party,men usu-ally pay. These days,men and women are equal in many