Given: Radius of the base and the height of a cone is increased by 20%

The volume of the cone is : πr²h

New radius = r + r = r = r

Similarly, new radius = h

New Volume = × π × (r)² × (h) = × πr²h

Increase in volume = × πr²h – πr²h = × πr²h

∴ Increase in % =( × 100 )% = 72.8%

∴ Volume will be increased by 72.8%