Thinking of going to Hong Kong to play, do not know how much consumption ?

It depends on where you stay. New Territories and Kowloon are definitely cheaper, around 400-500 HKD. Hong Kong Island is more expensive, not recommended to stay. Eating, going to those small restaurants are the most authentic, and the portion is also big. The average consumption per person is around 50 HKD, you can eat very full. The tea restaurant is a bit more expensive because the main dishes are dim sum.