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Q.

Twenty-one cylindrical pillars of the Parliament House are to be cleaned. If the diameter of each pillar is 0.50m and height is 4 m, what will be the cost of cleaning them at the rate of Rs. 2.50 per square meters?


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a

Rs. 330

b

Rs. 300

c

Rs. 350

d

Rs. 390 

answer is A.

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Detailed Solution

It is given each pillar of diameter 0.50 m and height 4 m and the cost of cleaning them is at the rate Rs. 2.50 per square meters.
Diameter of pillar = 0.50mm
Height of pillar = 4m
Radius= diameter 2  
Radius Question ImageRadius =0.25m  
The curved surface area of the pillar,
C.S.A.=2πrh ⇒C.S.A.= 2× 22 7 ×0.25×4  
⇒C.S.A.   = 44 7 ×1  
⇒C.S.A.   Question ImageCurved surface area of 21 pillars,
Question Image  Cost of cleaning the pillars at the rate of Rs.2.50 per m 2   Question ImageThe Cost of cleaning the pillars is Rs. 330.
Hence option (1) is correct.
 
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Twenty-one cylindrical pillars of the Parliament House are to be cleaned. If the diameter of each pillar is 0.50m and height is 4 m, what will be the cost of cleaning them at the rate of Rs. 2.50 per square meters?