Calculate the cost to paint a water tank in the shape of a sphere having a radius of 7 cm, if the cost of painting is Rs. 4.5/cm2. ( π = 22/7 )
Show answer & explanation
Correct answer: D
Explanation
The correct answer is option 4 i.e. Rs. 2,772.
Radius r = 7 cm
Total surface area of the tank = 4πr2
= 4 × 22/7 × 72
= 616
The cost of painting = Rs. 4.5 × 616 = Rs 2,772