A restaurant hall is 20 metres long, 15 metres wide and 10 metres high. The interior of the hall except the ceiling and the base has to be covered with a bright wall paper. What will be the total expenditure if the wall paper costs Rs.60 per square metre?

Length = 20 m

Breadth = 15 m

Height = 10 m

To find:

Total costing to cover the walls

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

The area of the hall to be covered = 2H(L+B)

= 2× 10(20+15)

= 2 ×10 × 35

= 700 m²

2) Rate of covering the wall is ₹ 60 / m²

Total expenditure = Area×rate

= 700 × 60

= ₹42000

Total costing to cover the walls ₹42000.