Question

A mansion has $12$ right cylindrical pillars each having radius $50cm$ and height $3.5m$. Find the cost to paint the lateral surface of the pillars at Rs.$20$ per square metre.

Answer 1

We have,

$12$ right cylinder pillars each having radius $50cm$ and height $3.5m$.

$r=0.5m$

$h=3.5m$

Cost of paint $=Rs.20per{m}^2$

We know that the lateral surface area of the cylinder

$=2\pi rh$

According to the question,

Total cost $=12\times 20\times 2\times \frac{22}{7}\times 0.5\times 3.5$

$=12\times 20\times 2\times 22\times 0.5\times 0.5$

$=Rs.2640$

Hence, this is the answer.