A cone of height 15 cm and basedlameter 30cm is carved out of a wooden sphere of radius 15 cm. The percentage of wasted wood is:

A cone of height 15 cm and basedlameter 30cm is carved out of a wooden sphere of radius 15 cm. The percentage of wasted wood is:
1). 75%
2). 50%
3). 40%
4). 25%

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