bencake

題目誤導人~" n% u- z4 ]5 @1 O
owner 100
) H$ S6 j! T  k/ qowner's son 20
! }3 Z7 L" R4 e; t& q7 _0 d5.39.217.77each pay 405.39.217.776 ]! G, x, u  `  W! k
40*3 = 120公仔箱論壇$ @4 {9 b9 L0 Z: |0 J5 ~( c
120(3 guys) - 20(owner's son) = 100 (owner)