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K = 2(p+l) = 600
p+l = 300
l = 300 - p
L = p*l
L = p(300-p)
L = 300p - p^2
akan maksimum jika:
p = -(300)/[(-1)*2]
p = (-300)/(-2)
p = 150 m
l = 300 - p = 150 m