The cost of painting a spherical vessel of radius 7 cm is Rs. 18,480. What is the cost of painting per square centimetre? (Use π = $$\frac {22}7$$​ )

Correct option is C

Given:
Radius of the spherical vessel = 7 cm
Total cost of painting = Rs. 18,480
Value of π = $$\frac {22}7$$​​
Formula Used:
Surface area (A) of a sphere = 4πr²
where,
'r' is the radius of the sphere.
​$$\text{Cost of painting per square centimetre} = \frac{\text{Total cost of painting}}{\text{Surface area of the sphere}}$$​​
Solution:
​$$A = 4 \times \left( \frac{22}{7} \right) \times 7^2 \\A = 4 \times \left( \frac{22}{7} \right) \times 49 \\A = 4 \times 22 \times 7 = 616 \, \text{cm}^2 \\\text{Cost per square cm} = \frac{18,480}{616} = Rs. 30$$​​
Thus, the cost of painting per square centimetre is Rs. 30.