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misal :
P(x) = (2x + 1000/x - 40) x
P(x) = 2x^2 - 40x + 1000
Agar biaya minium :
P'(x) = 0
4x - 40 = 0
x = 10
P(10) = 2(10)^2 - 40(10) + 1000
P(10) = 200 - 400 + 1000
P(10) = 800
Jadi, biaya minimum proyek tersebut adalah Rp 800.000.000 , 00.