if we apply a visa upon arrival to visit Hong Kong and Mainland China, are we qualified and how much would the charge

good day..
i am holding a philippine passport, i am planning to visit hongkong for 2 days and 2 days in china (to visit the great wall of china with my brother who is also holding a philippine passport). if we apply a visa upon arrival, are we qualified and what are the requirements and how much would the charge.


regards,
emma