A solid cone of height 36 cm and radius of base 9 cm is melt

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A solid cone of height 36 cm and radius of base 9 cm is melted to form a solid cylinder of radius 9 cm and height 9 cm. What percent of material is wasted this process?

[2017 SSC CGL 12 AUG Shift 3]

A 25

B 0

C 5

D 10