the internal measures of a cuboidal room are 12m×8m×4m. find the total cosr of white washing all four walls of a room, if the cost of white washing is ₹5m per sq .what will be the cost of white washing if the ceiling of the room is also white washed?
Answers
Lateral surface area = 2(l+b) h
= 2(12+8)4 = 8*20= 160 sq m
Cost rs. 5 per sq m
Total cost = 160* 5 = rs. 800
Area of ceiling = 12*8 = 96 sq m
So, cost = rs 5 * 96
= rs. 480
Total cost = 800+480
=rs.1280
Answer:
The cost of white washing four walls of room=₹800
the cost of white washing if the ceiling of room is also white washed=₹1280
Step-by-step explanation:
Three dimentions of room = 12m×8m×4m
Area of four walls = 2×(l+b)×h
=2×(12+8)×4
=2×20×4
=160m²
cost of whitewashing=₹5×area of four walls
=₹5×160
=₹800
Area of ceiling of the room=l×b
=12×8
=96m²
cost of white washing ceiling of the room=₹5×96
=₹480
total cost of white washing=cost of white washing of four walls+ cost of
white washing ceiling of room
=₹800+₹480
=₹1280