Question

A restaurant hall is $20m$ long, $15m$ wide, and $10m$ high. The interior of the hall except the ceiling and the base has to be covered with bright wallpaper.

What will be the total expenditure if the wallpaper costs $₹60$ per square meter?

Answer 1

Length $=20m$

Breadth $=15m$

Height $=10m$

To find:

Total cost to cover the walls

1) Only the walls of the rectangular hall are included when you covered it with the wallpaper, So;

The area of the hall to be covered $=2h\left(l+b\right)$

$$\begin{gathered} =2\times 10\left(20+15\right) \\ =2\times 10\times 35 \\ =700m^2 \end{gathered}$$

2) Rate of covering the wall is $₹60/m^2$

Total expenditure $=$ Area × rate

$$\begin{gathered} =700\times 60 \\ =₹42000 \end{gathered}$$

The total cost to cover the walls is $₹42000$.