13. (e) In a building there are 24 cylindrical pillars. The radius of – InterviewSolution

1.	13. (e) In a building there are 24 cylindrical pillars. The radius of each pillar is 28 cm and heightFind the total cost of painting the curved surface area of all pillars at the rate of 8
Answer» Radius of cylinderical pillars = r = 28cm =0.28mheight ,h=4mcurved surface area of a cylinder =2πrhcurved surface area of a pillar= 2×22\6×0.28×4=7.04metresq.Curved surface area of 24 such pillars = 7.04×24=168.96metresq.cost of cementing an area of 1metresq. =Rs8so,cost of painting 1689.6metresq.=168.96×8=Rs1,351.68

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