2012 · Q25
What will be the cost to plaster the inner surface of a well 14 m deep and 4 m in diameter at the rate of Rs. 25 per square meter?
Elementary MathematicsMensuration
- A4000
- B4200
- C4400
- D5400
Explanation
Curved surface = 2*pi*2*14 = 176 sq m; cost = 176*25 = Rs. 4400.