Solution:
Given data:Length of box (l) = 80cm.
Breadth of box (b)= 30cm.
Height of box (h)= 40cm.
The box is drawn from the given data. It is in cuboid shape.
The area of cuboid box is 2(l × b) + 2(b × h) + 2(l × h).
Area of paper required = area of base +2 area of side to be covered +area of back.
⟹ (l × b) + 2 (b × h) + (l × h)
⟹(80×30)+2(30×40)+(80×40) ⟹2400+2400+3200 ⟹8000cm2 Hence, the area of the box to be covered is 8000cm2.
Therefore, option 3 is correct.
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