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= 0,75 m²
= 7.500 cm²
L kubus = 6 s²
= 6 (12,5)²
= 937,5 cm²
Jumlah kubus = 7.500 / 937,5 = 8 kubus
Jawaban: B
38. Biaya minimal = L kubus × harga kertas
= 6 s² × harga kertas
= 6 (0,15)² × Rp6.000
= 0,135 × Rp6.000
= Rp810
Jawaban: A
39. Berukuran 10 cm × 8 cm
Jawaban: C
40. L balok = 2pl + 2pt + 2lt
= 2 (15 x 10) + 2 (15 x 12) + 2 (10 x 12)
= 2 (150) + 2 (180) + 2 (120)
= 300 + 360 + 240
= 900 cm²
Jawaban: D