Q. If the diameter of a sphere is increased by 20%, its volume increases by:
✅ Correct Answer: (B)
72.8%
Explanation: Volume ∝ d³. (1.2)³ = 1.728, so the increase is 72.8%.
Explanation by: Mahesh Chandra
Volume ∝ d³. (1.2)³ = 1.728, so the increase is 72.8%.