A cylindrical concrete pillar has a radius of 0.5 m and a height of 4 m. If the curved surface is to be plastered at ₹180 per m², what will be the total plastering cost for 12 such pillars?
Show answer & explanation
Correct answer: C
Explanation
Given:
r = 0.5 m, h = 4 m
Curved surface area of a cylinder = 2πrh
Curved surface area of one pillar = 2 × 3.14 × 0.5 × 4
= 12.56 m²
Total area of 12 pillars = 12.56 × 12 = 150.72 m²
Now, total cost = 150.72 × 180 = ₹27,129.60