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A solid hemisphere is attached to the to...

A solid hemisphere is attached to the top of a cylinder, having the same radius as that of the cylinder. If the height of the cylinder were doubled (keeping both radii fixed), the volume of the entire system would have increased by 50%. By what percentage would the volue have increased if the radii of the hemisphere and the cylinder were doubled (keeping the height fixed)?

A

3

B

4

C

5

D

6

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