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Verified answer
Biaya pd x jam (y) = (3x - 600 + 60/x) × x [ratus ribu rupiah]y = 3x² - 600x + 60 [ratus ribu rupiah]
Syarat biaya minimum ---> y' = 0
y' = 0
6x - 600 = 0
6x = 600
x = 600/6
x = 100 jam
Biaya minimum jika produksi selesai dalam 100 jam