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The internal and external diameters of a hollow hemispherical vessel are \(20 \ cm\) and \(28 \ cm\), respectively. Find the cost to paint the vessel all over at \(₹0.14 \) per \(cm^2\).
Answer:
The cost to paint the vessel \(=\) \(₹\)
[Note: Enter your answer up to two decimal places]
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