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The length, breadth and height of a closed wooden box are 1 m, 60 cm and 40 cm respectively.

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The length, breadth and height of a closed wooden box are 1 m, 60 cm and 40 cm respectively. Find the external surface area of the box.

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External surface area = 2 (lb + bh + hl)

= 2[100 x 60 + 60 x 40 + 40 x 100]

= 2[6000 + 2400 + 4000]

= 2[12400]

= 24800 cm2

= 2.48 m2

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