In a building , there are 16 cylindrical pillars. The radius of each pillar is 21 cm and height is 3 m. find the curved surface area of all pillars and cost of white washing @ Rs. 9.50 per sq metre.
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⇒ C.S.A. of are pillar =2× 22/7×28×4=704cm 2
⇒ C.S.A. of 24 pillars =24×704=16896cm 2
=16896×10 power of −4 m2
=1.69m2 ⇒ Total cost Rs. 8×1.69=Rs.13.52
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