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(i) The radius of a spherical balloon increases from 7 cm to 14 cm as air is being pumped into it. Find the ratio of surface areas of the balloon in the two cases.
(ii) A hemispherical bowl made of brass has inner diameter 10.5 cm. Find the cost of tin-plating it on the inside at the rate of Rs.16 per 100 cm2.

Asked by Topperlearning User 4th June 2014, 1:23 PM
Answered by Expert
Answer:
Answered by Expert 4th June 2014, 3:23 PM
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