Question

The perimeter of the floor of a room is 40 m and its
height is 3.5 m. Find the area of the four walls of the
room. Also find the cost of preparing the four walls at
35 per m.​

Answer 1

Step-by-step explanation:

perimeter of floor = 40

height is 3.5

perimeter of rectangle =2(l+b)

40=2 (.l + b)

40/2 =(l+b)

20= ( l + b )

area of four walls = 2*h ( l + b)

= 2*3.5 * 20

= 140msq

cp of 1 m preparing = 35

140m. = 35*140= 4900rs