Twenty cylindrical pillars of a building are to be cleaned. If the diameter of the pillar is 0.5m and height 4m,What will be the cost of cleaning them at the rate of Rs.3 per square meter
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surface area of cylinders = 20× 2π0.25×4 880/7m²
cost = 880/7×3
Rs. 41.904
cost = 880/7×3
Rs. 41.904
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