Question

# A milk tin in the shape of a cuboid has dimensions 23 cm × 24 cm × 45 cm . If 1 sq.m sheet costs  ₹ 10, then the total cost for making 20 such tins is _______. ₹ 106.6₹ 136.6₹ 126.6₹ 116.6

Solution

## The correct option is A ₹ 106.6Given the dimensions of the cuboidal milk tin: Length (l) = 23 cm, Breadth (b) = 24 cm, and Height (h) = 45 cm. Total surface area of one milk tin is 2(lb+bh+hl). Total surface area of the tin sheet required = Total surface area of 20 milk tins ⇒ Area of 20 milk tins = 20×2(lb+bh+hl) =20×2(23×24+24×45+45×23) =106680 cm2 =10.66 m2 (∵1 m2=10000 cm2) Cost of 1 m2 tin sheet = ₹ 10. Hence , the cost of  10.66  m2 tin sheet = ₹ 10 × 10.66 = ₹ 106.6 So, total cost for making 20 such tins = ₹ 106.6

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