11. Five marks exercise problem II

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]