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Luas Permukaan Tanpa Tutup Balok = Luas Alas + ( Keliling Alas × Tinggi )
= ( P × L ) + ( ( 2 × (P + L)) × 50)
= ( 80 × 30 ) + ( ( 2 × (80 + 30)) × 50)
= 2400 + ( ( 2 × 110 ) × 50)
= 2400 + ( 220 × 50 )
= 2400 + 11.000
= 13.400 Cm²