A cylindrical pillar has a diameter of 1.4 m and 2.5 m height. The cost of white washing its outer surface at Rs 5 m^2 is​

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   Given a cylindrical pillar diameter of 56cm and its height is35m.

   Then radius of pillar =

   2

   56

   cm=

   100

   28

   m=0.28m

   Then curved surface area of pillar =2πrh=2×

   7

   22

   ×0.28×35=61.60m

   2

   Then the curved surface area of 16 pillars =61.60×16=985.60m

   2

   Given the cost of painting the curved surface area of all pillar at the rate of Rs5.50 per 1sqm

   Then the cost of paining of 16 pillars =985.60×5.50=5420.80 Rs

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