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turunan = 120 - 12x = 0
12x = 120
x = 10
120 - 24X = 0
24X = 120
X = 5
L(X) = 120X - 12X^2
L(5) = 120(5) - 12(5)(5)
= 600 - 300
= 300 ratusan rupiah
= 30.000 rupiah
jawaban terbaik yaaa