In a building there are 30 cylindrical pillars. The radius of each pillar is 35 cm and height is 5 m. Find out the cost of painting the curved surface of half the number of pillars. The rate of painting is Rs. 10 per $$m^2$$.
Curved surface area of cylindrical pillar is given as A = 2$$\pi$$rh, where 'r' is base radius and 'h' is height of the cylinder.
So curved surface area of each pillar A = $$2\times \pi\times 0.35\times 5 = 11 m^2$$
Given there are 30 cylindrical pillars.
The curved surface area of half the number of pillars = 15 * A = 165 $$m^2$$.
Given rate of painting is Rs. 10 per $$m^2$$
The cost of painting curved surface of half the number of pillars = Curved surface area * rate of painting
= $$165\times 10$$
= Rs. 1650.
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