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biaya(x) = (2x + 1000/x - 40)x
2x² + 1000 - 40x
turunin = 0
4x - 40 = 0
4x = 40
x = 10
biaya(10) = 2(10)² + 1000 - 40(10)
= 200 + 1000 - 400
= 800 pilihan d