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 m2​

Answer 1

Answer:

4900

Explanation:

csa of rectangle is 2×l+b×h

perimeter of rectangle is 40

height 3.5so, CSA is 40×3.5= 140

cost is 140 ×35 =4900

Answer 2

Answer:

area of four walls of the room = 140m^2. and cost of preparing the four walls = Rs 4900

Explanation:

here, perimeter of the floor 2 ( l+b ) = 40m. and height = 3.5m. therefore area of four walls of the room = 2 ( l + b ) h = 40 × 3.5 = 140 m ^2 . Now , the cost of preparing the four walls = 140 × 35 = ₹4900 .