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The internal and external diameters of a hollow hemisphere vessel are 21cm and 25.2 cm The cost of painting 1cm2 of the surface is 10paise. Find total cost to paint the vessel all over______?

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Given that internal diameter of hollow hemisphere (r) = 21/2 cm = 10.5cm

External diameter (R) = 25.2/2 = 12.6 cm

Total surface area of hollow hemisphere

Given that cost of painting 1cm2 of surface = 10 ps 

Total cost for painting 1843.38cm2

=1843.38 x 10 ps 

=184.338 Rs.

Total cot to paint vessel all over = 184.338 Rs.

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