# 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.

H Harsh Kankaria

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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