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?

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Solution

## Length $=20m$Breadth $=15m$Height $=10m$To find:Total cost to cover the walls1) 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 $=2h\left(l+b\right)$ $=2×10\left(20+15\right)\phantom{\rule{0ex}{0ex}}=2×10×35\phantom{\rule{0ex}{0ex}}=700{m}^{2}$2) Rate of covering the wall is $₹60/{m}^{2}$Total expenditure $=$ Area × rate $=700×60\phantom{\rule{0ex}{0ex}}=₹42000$The total cost to cover the walls is $₹42000$.

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