Discussion

Explanation:

Ratio of areas of two spheres = s1 : s2 = 4 : 1

∴ Ratio of their radii = r1 : r2 = 2 : 1

∴ Ratio of their volumes = v1 : v2 = 8 : 1

Volume of A is 12.5% (1/8th) of the volume of B.

But, volume of A is k% less than B.

∴ k = (100 − 12.5) = 87.5%

Hence, option (d).

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