the level of water rise in the tank in half an hour?18. The internal and external diameters of a hollow spherical vessels are 21 cm and 25.2 cmrespectively. The cost of painting 1 cm 2 of the surface is 10 paise. Find the total cost to paint thevessel all over.an the nuter and inner curved surface areas of hollow right circular

the level of water rise in the tank in half an hour?18. The internal a

1.	the level of water rise in the tank in half an hour?18. The internal and external diameters of a hollow spherical vessels are 21 cm and 25.2 cmrespectively. The cost of painting 1 cm 2 of the surface is 10 paise. Find the total cost to paint thevessel all over.an the nuter and inner curved surface areas of hollow right circular
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