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A plastic box 1.5m long, 1.25m wide and...

A plastic box ` 1.5m` long, `1.25m` wide and 65 cm deep is to be made. It is opened at the top.Ignorian 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 measureing `1m^(2)` costs `Rs 20.

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