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]