Question

please see attached​

Answer 1

Answer:

we have

length=5m

breadth=4m

height=3m

now

we find the cost of white washing the walls of the room

now

lateral surface area of cuboid=2(l+b)h

=2(5+4)3

=2×9×3

=2×27

=54cm²

now

area of rectangle =lb

=5×4

=20cm²

so

total area

=20+54

=74cm²

now

the celling at the rate of$7.50 per m²

so

=74×7.50

=74×750/100

=74×1/2

=37