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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 (ii) The cost of sheet for it, if a sheet measuring 1 m^2 costs Rs 20

Q : 1       A plastic box \small 1.5\hspace {1mm} m long, \small 1.25\hspace {1mm} m wide and \small 65\hspace {1mm} cm deep is to be made. It is opened at the top. Ignoring the thickness of the plastic sheet, determine:

              (ii) The cost of sheet for it, if a sheet measuring \small 1m^2  costs Rs 20.

Answers (1)
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Given, dimensions of the plastic box

Length, l = 1.5\ m

Width, b = 1.25\ m

Depth, h = 65\ cm = 0.65\ m

We know, area of the sheet required for making the box is 5.45\ m^2

(ii) Cost for  \small 1m^2 of sheet = Rs 20

\therefore Cost for 5.45\ m^2 of sheet = 5.45\times20 = 109

Required cost of the sheet is Rs.\ 109

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