SSC CHSL 2024 PYQ — Question 56

The correct answer is option 4 i.e. Rs. 8000.

Given that

The diameter of the sphere = 10 m

The radius of the sphere = r = 5 m

Rate of painting = $\frac{80}{\pi}$ per m²

Formula used 

The surface area of a sphere = 4 × π × r² 

Hence, the surface area of the sphere = 4 × π × 5² = 100 × pi m²

The total cost of painting the sphere = 100 × π × $\frac{80}{\pi}$ = 8000

Hence, the total cost of painting the sphere is Rs. 8000.