2. Read the following passage and answer the questions given at the end :
Students of Class XII presented a gift to their school in the form 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.
(1) What is the cost of silver coating the top at the rate of 5 per 100 em??
Gi) What is the surface area of glass to be painted red?!
1-30/3/3.
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