Find the area of the four walls of a room whose length is `6\ m ,` breadth `5\ m` and height `4\ m` . Also find the cost of white-washing the walls, if the rate of white washing is Rs. `5\ p e r\ s q u a r e\ m e t e rdot` (Doors, Windows and other opening ignored)

Explanation

Given:
`l=6 m`
`b=5 m`
`h=4 m`
Rate`=Rs. 5 perm^2`
Area of four walls of the room
`=2h(l+b)`
`=2×4(6+5)=8×11=88 m^2`
`therefore` Cost of white washing`=88×Rs. 5=Rs. 440`