Q. If the radius of a sphere is decreased by 20%, then its volume decreases by:
✅ Correct Answer: (B)
48.8%
Explanation: Volume ∝ r³. (0.8)³ = 0.512, hence decrease = 48.8%.
Explanation by: Mahesh Chandra
Volume ∝ r³. (0.8)³ = 0.512, hence decrease = 48.8%.