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Question

An oil tin in the shape of a cuboid has dimensions, 26 cm × 26 cm × 45 cm . If 1 sq. m sheet costs ₹10 , then the total cost for making 20 such tins is ____.

A
₹120.64
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B
₹125.60
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C
₹128.60
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D
₹129.60
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Solution

The correct option is A ₹120.64
Given the dimensions of the cuboidal oil tin,
length(l) = 26 cm, breadth(b) = 26 cm and height(h) = 45 cm

Total surface area of oil tin = 2 (lb + bh + hl)
=2(26×26+26×45+45×26)=6032 cm2

Total area of the tin sheet required = Area of 20 oil tins
=20×6032
=120640 cm2
=12.064 m2 (1 m2=10000 cm2)

Cost of 1 m2 tin sheet = ₹10
Hence, the cost of 12.064 m2 tin sheet
= ₹10 × 12.064
= ₹120.64

So, total cost for making 20 such tins = ₹120.64

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