" 29.The radius of a sphere is doubled.Find the increase per cent in its surface area."

The radius of a sphere is doubled. The percentage of increase in its surface area is

If the radius of a sphere be doubled, then what percent of its whole surface area will be increased ?

The radius of a sphere is 7 cm. Find its surface area.

The radius of a sphere increases by 25% . Find the percentage increase in its surface area.

If the radius of a sphere is doubled, what will be the ratio of its surface area and volume as to that of the first?

If the radius of a sphere is doubled, what will be the ratio of its surface are and volume as to that of the first sphere?

If the radius of a sphere is increased by 50%, find the increase percent in volume and the increase percent in the surface area.