. 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,

(i) determine the area of the sheet

(ii) the cost of sheet for it, if a sheet measuring 1m2 costs Rs. 20 .

Best Answer

Explanation:

We are given,

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

(i) Area of sheet required =21b+2bh+21h-1b

(i) Area of sheet required  =21b+2bh+1b...[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=5,45m2

ii) Cost of sheet per m2 area  = Rs. 20

Cost of sheet of 5.45m2 area  = Rs. 5.45×20

=Rs.1o9

Final answer:

The area of the sheet is  and the cost of sheet is .

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