Question

Question :- A plastic box 1.5 m long, 1.25 m wide and 65 cm deep is to be made. It is opened at the top. Ignoring the thickness of the plastic sheet, determine (i) The area of the sheet required for making the box. (ii) The cost of sheet for it, if a sheet measuring 1m2 costs ₹20.

Answer 1

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Answer 2

Explanation:

Given:

Length of box =1.5 m, Breadth =1.25 m, Height =0.65 m

⇒Area to be white-washed = Area of cuboid − Area of base.

(i) Area of sheet required =2lh+2bh+lb .....[Box is open]

=[2×1.5×0.65+2×1.25×0.65+1.5×1.25]m²

=(1.95+1.625+1.875)m²

=5.45 m²

ii) Cost of sheet per m²

area = Rs. 20

Cost of sheet of 5.45m²

area = Rs. 5.45×20

= Rs. 109

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