Question

the internal measures of a cuboid room are 12m×8m×4m. find the total cost of white washing all four walls of a room if the cost of white washing is ₹5 per m² what will be the cost of white washing if the ceiling of the room is also white washed ​

Answer 1

Dimensions = 12m * 8m * 4m

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