Question

The length, breadth and height of a classroom 10 m, 7.5 m, 4m respectively. It has two doors of dimensions 2m×1m and two windows of dimensions 1m×1m. Find the cost of white washing the four walls internally at a rate of Rs.15 per meter square.​

Answer 1

Answer:

Solution

verified

Total surface area of the room=2(lh+lb+hb)m

2

=2[9×6.5+9×8+8×6.5]m

2

=365m

2

Area of the door =l×b=2×1.5=3m

2

Area of the windows=l×b=1.5×1=1.5m

2

∴ Surface area of walls=TSA of room −Area of door−Area of windows

=365−3−1.5=360.5m

2

Cost of whitewashing per square meter=Rs. 6.40

∴ Cost of whitewashing the walls=Rs. 6.40×360.5

=Rs. 2307.2.

Answer 2

Step-by-step explanation:

Solution:

cost of white whashing the four walls = 6.40×360.5

= Rs. 2307.2