There are 20 cylindrical pillars in a building, each having a diameter of 50 cm and height 4m. Find the cost of cleaning them at Rs 14 per `m^(2)`.

Answer

Rs 1760

Explanation

Lateral surface area to be cleared
`= (2 xx (22)/(7) xx (25)/(100) xx 4 xx 20) m^(2) = ((880)/(7)) m^(3)`
Cost of cleaning `= Rs ((880)/(7) xx 14) = Rs 1760`