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= 2 x 64 =128
panjang = 9
lebar = 7
tinggi = 4
biaya cat = 50.000
maka luas y akan di cat (L)
L = 2 x [(9x4)+(7x4)]
= 2 x [36 + 28]
= 2 x 64
= 128 m²
maka biaya y dibutuhkan = 128 x 50.000 = Rp 6.400.000