If the radius of the right circular cylinder is decreased by 20% while its height is increased by 40%, then the percentage change in its volume will be ?
Show answer & explanation
Correct answer: B
Explanation
The correct answer is option 2 ie 10.4% decrease.
⇒ π r2h
⇒ πr21h1
⇒ π × (0.8)2 × 1.4
⇒ π × 0.896
⇒ 100 = 89.6
⇒ 10.4% decrease