Question

A room having length 4m and breadth 3m contains 192m^3 of air .It has a windows of 1m*1m and a door of 2m*1m, Find the total cost of colouring on its four walls at the rate of RS 250 per m^2.

Answer 1

Step-by-step explanation:

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It is given that length, breadth and height of a room are 8 m, 5 m and 3 m respectively.

Area of four walls of the room is: 2h(l+b)

A=2h(l+b)=2×3(8+5)=6×13=78 m^2

Area of the ceiling is:

A=l×b=8×5=40 m^2

Total area of the four walls and the ceiling of the room is 78+40=118 m^2

It is given that cost of white washing is Rs.15/m^2

, therefore,

Total cost of white washing is:

118×15=1770

Hence, the cost of white washing the walls is Rs.1770.