Aman wants to get his spherical overhead water tank having a diameter of 7 m, painted. If the cost of painting is Rs 13 per square meter, find the cost of painting Aman's spherical overhead water tank. (Use π = 22/7)
Show answer & explanation
Correct answer: C
Explanation
The correct answer is option 3 i.e. Rs 2002
Diameter = 7 cm
The cost of painting is Rs 13 per square meter
The total surface of a sphere = 4πr2
Where, r = radius
According to the question;
⇒ TSA = 4 × 22/7 × (7/2)2
⇒ 154 cm2
Required cost of painting = 154 × 13 = Rs 2002