The surface of a cylindrical tank of base diameter 28 m and height
5400 cm has to be painted. Find the cost of painting the surface of the
tank at the rate of 20 per m². Also find its capacity in litres.
Answers
Given : cylindrical tank of base diameter 28 m and height 5400 cm
To Find : the cost of painting the surface of the tank at the rate of 20 per m².
capacity in litres.
Solution:
Diameter = 28 m
=> Radius = 28/2 = 14 m
Height = 5400 cm = 54 m
Surface area = 2πrh + 2πr²
= 2πr(h + r)
= 2(22/7)14 (54 + 14)
= 88 ( 68)
= 5984 m²
cost of painting the surface of the tank at the rate of 20 per m². = 20 * 5984 = Rs 1,19,680
Volume = πr²h
= (22/7)(14)² * 54
= 22 * 28 * 54
= 33264 m³
1 m³ = 1000 litre
Capacity = 33264 * 1000 litre
= 33264000 litre
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