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A cylindrical pillar has a diameter of 56 cm and is of 35 m high. There are 16 pillars around the building. Find the cost of painting the curved surface area of all the pillars at the rate of ₹ 5.50 per 1 m2.

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Diameter of the cylindrical pillar = 56 cm

Thus its radius, r = d/2

= 56/2 = 28 cm = 28/100 m = 0.28m

Height of the pillar, h = 35 m 

Total number of pillars =16 

Cost of painting = ₹ 5.50 per sq. m. 

C.S.A. of each pillar = 2πrh 

= 2 × 22/7 × 0.28 × 35

= 2 × 22 × 0.04 × 35 = 61.6 m2 

∴ C.S.A. of 16 pillars = 16 × 61.6 = 985.6 m2 

Cost of painting 16 pillars at the rate of ₹ 5.5 per sq.m.

= 985.6 × 5.5 

= ₹ 5420.8

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