A classroom is 7m long 6.5m wide and 4m high it has a door measuring 2m×1m , the interior of the wall are to be painted at the rate of rupees 200 per square m find the cost of the painting
Answers
Answer:
Step-by-step explanation:
Area of four walls=(2h(l+b))
=(2x4(7+6.5))
=(8x13. 5)
=108m square
area of one window =3mx1. 4m
=4.2m square
area of three window =3(2mx1m)
=6m square
total area of windows =(4.2+6)m square
=10.2m square
Area for whitewashing =(108-10.2)m square
=97.8m square
cost of 1 m square white washing = 3.50rupee
cost of 97.8m square white washing=3.50x97.8
=342.3 rupees
l = 7m n = 6.5m and h = 4m ∴ Area of the room = 2 l + bh = 27 + 6.5 4 = 108m^2
Area of door = 3 × 1.4 = 4.2m^2
Area of one window = 3 × 2 = 6m^2
∴ Area of 3 windows = 3 × 2 = 6m^2
∴ Area of the walls of the room to be colour washed = 108 - 4.2 + 6 = 108 - 10.2 = 97.8m^2
∴ Cost of colour washing Rs. 15 per square metre = Rs. 97.8 × 15 = Rs. 1467.
@Atik.Rehan