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In a building, there are 30 cylindrical pillars. The radius of each pillar is 35 cm and the 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 m2.
1. Rs. 16,500
2. Rs. 8250
3. Rs. 1650
4. Rs. 4125

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Correct Answer - Option 3 : Rs. 1650

Calculation:

35 cm = 0.35 m

CSA of one pillar = 2πrh = 2 × (22/7) × 0.35 × 5

CSA of half the total number of pillars = (30/2) × 2 × (22/7) × 0.35 × 5 = 165 m2

Cost of painting 15 pillars = 165 × 10 = Rs. 1650

∴ Cost of painting 15 pillars is Rs. 1650.

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