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p = 3 + l
K = 2p + 2l
54 = 2(3+l) + 2l
= 6+2l+2l
54-6 = 4l
48 =4l
12 = l
maka p = 12+3=15
L = p x l
12 x 15 = 180
Biaya yg diperlukan 180 x 4000= 720000