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Verified answer
Jawabp(x) = 120x - 3x²
Penjualan maksimum , jijka p'(x) =0
120 - 6x = 0
6x = 120
x = 20
P(20)= 120(20) - 3(20)²
P(20) = 2.400 - 1.200
P(20) = 1.200
Penjualan maksimum 1.200 (dlam ratusan ribu rp)
= 1.200 x 100.000
= 120.000.000