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)=6032cm2
Total area of the tin sheet required = Area of 20 oil tins =20×6032 =120640cm2 =12.064m2(∵1m2=10000cm2)
Cost of 1 m2 tin sheet = ₹10
Hence, the cost of 12.064 m2 tin sheet
= ₹10 × 12.064
= ₹120.64