Question

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

Answer 1

The cost of cleaning them at the rate of Rs. 2.50 per square metre is Rs 314

Solution:

Diameter = 0.50 m

$Radius = \frac{0.50}{2}$

Radius = 0.25 m

height = 4 m

Find the curved surface area of cylinder

$CSA = 2 \pi r h$

Where, "r" is the radius and "h" is the height

$CSA = 2 \times 3.14 \times 0.25 \times 4\\\\CSA = 6.28\ m^2$

What will be the cost of cleaning them at the rate of Rs. 2.50 per square metre?

$1\ m^2 = Rs\ 2.50$

Then, cost of cleaning 20 pillars is:

$20 \times 6.28 \times 2.50 = 314$

Thus, cost of cleaning them at the rate of Rs. 2.50 per square metre is Rs 314

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