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90 = 50
100 55 + x (DIKALI SILANG)
=> 90 . 55 + x = 5000
=> 4950 + x = 5000
=> x = 5000 - 4950
=> x = 5 cm
Sisa karton bagian bawah adalah 5 cm
kalau ga salah,begitu
mudah2an benar...