9. In a building there are 24 cylindrical pillars. The radius ofeach p – InterviewSolution

1.	9. In a building there are 24 cylindrical pillars. The radius ofeach pillar is 28 cm and height is 4 m. Find the total costof painting the curved surface area of all pillars at the rateof Rs 8 per m2
Answer» Curved Surface Area of a cylinder.= 2πrh So CSA of one cylinder = 2×π×(0.28)×4Putting π=22/7, we get,=2×22×(0.4)×4 = 70.4 So for 24 cylinders, csa = 24×70.4 = 1689.6 m sq.So cost = 8×1689.6 = 13516.8 Rs.

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