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Explanation:

Let the initial side of the cube be 2 cm.
∴ Total surface area initially = 6 × 22 = 24 cm2.

Now the new side of the cube is 1 cm.
∴ Total surface area now = 6 × 12 = 6 cm2.

⇒ % change in total surface area = (24 - 6)/24 × 100% = 75%

Hence, option (a).


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