The internal and external diameters of a hollow hemispherical vessel are 24cm and 25cm respectively. The cost to paint `1c m^2` the surface is Rs. 0.05. Find the total cost to paint the vessel all over. `(u s epi=(22)/7)`

Explanation

To solve the problem, we need to find the total surface area of the hollow hemispherical vessel and then calculate the cost to paint it based on the given rate.

### Step 1: Find the internal and external radii of the hemispherical vessel.
- The internal diameter is 24 cm, so the internal radius \( r_1 \) is:
\[ r_1 = \frac{24}{2} = 12 \text{ cm} \]
- The external diameter is 25 cm, so the external radius \( r_2 \) is:
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