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.
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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
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