# Twenty cylindrica

Given,

Diameter of one pillar = .50m

Height of each pillar = 4m

Curved surface area of one pillar = 2πrh = 2

Area of 20 pillars = 20×6.28 = 125.60 m2

Cost of cleaning 1 m2 area = Rs. 2.50

cost of cleaning 125.60 m2 = 125.60×2.50 = Rs 314.28.

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