11. 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:
Length (l)= 40cm= 0.4 m
Breadth(b)= 30cm =0.3m
Height (h)= 50cm =0.5m
Total surface area(S)= l×b+b×h+l×h
S=0.4×0.3+0.3×0.5+0.4×0.5
S=0.12+0.15+0.20
S=0.47m^2
Cost of 1m^2 of metal sheet =45
Cost of 1 cuboid box made of metal sheet (C)=S×45
C=0.47×45=21.15
Cost of 20 cuboid boxes made of metal sheet=C×20=21.15×20=423 rupees
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