How big a ship needs to have a lifeboat

Requirements for the equipment of lifeboat, rescue boat and life raft:
      1 International passenger ships equipped with lifeboats should be able to accommodate the total number of persons on board 50%, at least not less than 37.5% (the other allows the raft instead).
      2 The captain is not less than 85 meters on each side of the ship equipped with lifeboats can accommodate up to 100% the total number of persons on board.
      3 The structure of the lifeboat is fully enclosed or partially enclosed.
      4 A total of 500 tons and above the passenger on each side is equipped with at least 1 ship rescue boat.
      5 Less than 500 of the total ton passenger ship is equipped with at least 1 ship rescue boat.
      6 Cargo ship at least 1 rescue boats.
      7 If the lifeboat meets the requirements of the rescue boat, the lifeboat is allowed to replace the rescue boat.
      8 International passenger ships ship equipped with a raft to accommodate the total number of the whole ship 25%.
      9 The cargo ship is equipped with a life raft that holds 100% of the total number of people on board.