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2(18x12 + 18x10 + 12x10)
2( 216+180+120)
2x516
= 1032
=2(18 x 12 + 18 x 10 + 12 x 10)
=2(216 + 180 + 120)
=2(516)
=1.032
Jawabannya yang (B)