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The number of coins, each of radius 0.75...

The number of coins, each of radius 0.75 cm and thickness 0.2 cm, to be melted to make a right circular cylinder of height 8 cm and radius 3 cm, is
0.75 सेमी त्रिज्या तथा 0.2 सेमी मोटाई वाले सिक्कों, जिन्हें पिघलाकर 3 सेमी त्रिज्या तथा 8 सेमी ऊँचाई वाला एक लम्बवृत्तीय बेलन बनाया जाता है, तो सिक्के की संख्या होगी?

A

640

B

600

C

500

D

480

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