Question

the l,b and h of a room 5,4,3 m. Find the total cost of white washing the cieling at the rate of Rs 12 per m square and four walls at the rate of Rs10 per m square

Answer 1

area of the ceiling of the house is equal to length into breadth that is equal to 5 into 4 metre square that is equal to 20 m square cost of whitewashing the ceiling is equal to 12 into 20 that is equal to rupees 240. cost of White House in the four walls at is equal to the lateral surface area of the cuboid that is equal to perimeter into height =2{l+b}×h
=3× 18=54m^2
therefore cost=54×10=₹540
total amount=540+240=780