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Trademark at the bottom of cuboid biscuit box
20X20=400 cm2 30X20=600 cm2 30X20=600 cm2 400+2X600= 1600 cm2.

The first step is to find the area of the bottom and top, the second step is to find the area of the left and right, the third part is to find the area of the front and back, and the fourth part is to find the area of the trademark paper.