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)

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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