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A solid metallic cylinder of height 10 c...

A solid metallic cylinder of height 10 cm and radius 6 cm is melted to make two cones in the ratio of volume 1:2 and of same height as 10 cm. What is the percentage increase in the flat surface area?

A

a)`25%`

B

b)`50%`

C

c)`75% `

D

d)`100%`

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