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3000 = 4b x 3b x 2b
3000 = 24 x b x b x b
3000 : 24 = b x b x b
125 = b x b x b
b = 5cm
p = 4b = 4 x 5 = 20cm
l = 3b = 3 x 5 = 15cm
t = 2b = 2 x 5 = 10cm
L permukaan = 2pl + 2pt + 2lt
=(2x20x15) + (2x20x10) + (2x15x10)
= 600 + 400 + 300
= 1300cm²