Question

A square wall with side 5 metres must be painted in white. The painting costs Rs. 250 per $m^2.$ Find the cost of painting 4 such walls.

• A. Rs. 25,000
• B. Rs. 25,250
• C. Rs. 25,500
• D. Rs. 24,500

Answer 1

The correct option is A Rs. 25,000

We must find the area that must be painted
For that, we use the formula of area of square.
Area of square = side $\times$ side
$=5\times 5$
$=25m^2$

Since we need to paint 4 such walls, we multiply this area by 4
Therefore, area to be painted $=25\times 4$
$=100m^2$

Now, the cost of painting $1m^2=Rs.250$
So, the cost of painting $100m^2=250\times 100$
$=Rs.25,000$