Question

The internal measures of a cuboidal room are $12m\times 8m\times 4m.$ Find the total cost of whitewashing all four walls of a room, if the cost of white washing is 5 per $m^2.$ What will be the cost of white washing if the ceiling of the room is also whitewashed.

Answer 1

The dimensions of room is $12\times 8\times 4$

The Lateral surface area is

$=2h(l+b)=2\left(4\right)(12+8)=8\times 20=160m^2$

Cost of white wash is $5m^2$

Total cost is $5\times 160=800Rs,$