How much volume will be decreased by
Answer: (1) 60%
Let the height of the right circular cylinder be h m and radius be r cm.
Then, volume of the circular cylinder = Pi r^2 h.
Value of the Pi is constant so all the effect depends on radius and height.
Let intial volume was 100.
100 = 50% down radius effect => 50 ==50% down radius effect => 25 == 60% up height effect = 40.
Now, 100 become 40, it means there is 60% decremented in volume.
Hence, the correct answer is option (1) 60%.