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Question
The dimensions of a cuboidal box are 6 m × 400 cm × 1.5 m. Find the cost of painting its entire outer surface at the rate of ₹ 22 per m2.
Solution
Length of the cuboid box (l) = 6
Breadth of the cuboid box (b) = 400 cm = 4 m
Height of the cuboid box (h) = 1.5 m
T.S.A of the cuboid = 2(lb + bh + lh) sq.units
= 2(6 × 4 + 4 × 1.5 + 1.5 × 6) sq.units
= 2(24 + 6 + 9)
= 2 × 39 sq.m
= 78 sq.m
Cost of painting for one sq.m = ₹ 22
Total cost of painting = ₹ 78 × 22
= ₹ 1716
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