The dimensions of a classroom are 10m, 8m and 5m. Find the cost of decorating its walls by a wallpaper of 1 m width, which costs 50 rupees for 1 sq.m.

Given:

The dimensions of a classroom are 10 m, 8 m and 5 m.

Width of the wallpaper $=1\ m$.

Cost of decorating per 1 sq. m.$=Rs.\ 50$.
To do:
We have to find the  cost of decorating its walls.

Solution:

We know that, lateral surface area of a cuboid of length $l$, breadth $b$ and height $h$ is $2h(l+b)$.

Therefore,

Lateral surface area of the classroom $=2\times5(10+8)\ m^2$

$=10\times18\ m^2$

$=180\ m^2$

Cost of decorating per 1 sq. m.$=Rs.\ 50$.

This implies,

Cost of decorating the walls of the classroom $=Rs.\ 50\times180\ m^2$

$=Rs.\ 9000$

The cost of decorating of the walls of the classroom is Rs. 9000.

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Updated on: 10-Oct-2022

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