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( ukuran pertama - ukuran terakhir )
______________________________________
selang waktu
contoh :
up = ukuran pertama
ut = ukuran terakhir
UP ( 20 - 60 ) UT = (60-20)
_________ _______ =
10 hari 10 hari
40 cm
_______ = 4 cm/hari
10 hari