Question

the perimeter of the floor of a room is 40m and its height is 3.5m. find the area of the four walls of the room. also find the cost of papering the four walls at rs35 per squre m.

Answer 1

Perimeter of floor of room=40m
Height of room=3.5m
Area of four walls=2 (l+b)h
=40m×3.5m
=140 square m
Cost of papering four walls per square m=Rs.35
Cost of papering four walls 140 square m=Rs.140×35=Rs.4900

Answer 2

perimeter of blower room 40m

hight of room = 3.5m

area of the four wall = 2(l×b)h

40m×3.5m

140 square m

cost of preparing floor wall pr square

m= 35

cost of preparing for walls 140 square

m = 140×35 = Rs 4900