Question

A closed box is a cuboid in shape with
length = 40 cm, breadth = 30 cm and
height = 50 cm. It is made of thin metal
sheet. Find the cost of metal sheets required
to make 20 such boxes, if 1 m2 of metal sheet
costs 45.​

Answer 1

Answer:

We need to calculate the total surface area of the cuboid to solve this question.

Total surface area of a cuboid of length l, breadth b and height h =2(l×b+b×h+l×h)

So, the total surface area of the cuboid =50cm=2(40×30+30×50+40×50)

=2(1200+1500+2000)=9400cm

2

Total surface area of 20 boxes =20×9400cm

2

=188000cm

2

=18.8m

2

Total cost =Rs45×18.8m

2

=Rs846