Question

A room is 12 m long, 8 m broad and 4 m high. It has
two doors, each measuring 2.2 m by 1.6 m and two
windows, each measuring 2.4 m by 2.2 m. Find the cost
of white washing its four walls at ₹7.70 per sqm.​

Answer 1

Answer:

1096.48 rupees

Step-by-step explanation:

Length=12 m

Breadth =8m

Height =4m

Area of 4 walls=2(l + b)h

=2(12+8)×4

=2×20×4

=160 m^2

Area of two door=2(2.2×1.6)

=2 (3.52)

=7.04 m^2

Area of two windows=2(2.4×2.2)

=2(5.28)

=10.56 m^2

Total area of doors and windows=7.04+10.56

=17.60 m2

Now,

Area of 4 walls excluding doors and windows= 160-17.60

=142.40 m2

Now cost of white washing=142.40×7.70

=1096.48 rupees