Students of Class XII presencted a gift ...

Students of Class XII presencted a gift to their school in the from of an electric lamp in the shape of a glass hemispherical base surmounted by a metallic cylindrical top of same radius 21 cm and height 3.5 cm. The top was silver coated and the glass surface was painted red
What is the cost of silver coating the top at the rate of `Rs.5 per 100 cm^2`?

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