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Q.

10 cylindrical pillars of the building have to be painted. The diameter of each pillar is 70 cm and the height is 4 m. What is the cost of painting at the rate of Rs 5 square meter?


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a

Rs 400

b

Rs 440

c

Rs 480

d

Rs 500 

answer is B.

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Detailed Solution

seoGiven, diameter =70 cm
Thus r = 35 cm = 35100m = 720m
Also given h=4 m
Curved surface area of 1 pillar = 2πrh
Curved surface area of 10 pillars = 10×2πrh = 20πrh
Cost:
= Rs.5 × 20πrh
= Rs. 100 × ​227 × 720 × 4
 = Rs. 440
Hence, Option (2) is the correct answer.
 
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