Answers

2015-03-15T18:29:23+05:30
2015-03-15T20:14:43+05:30
In order to find the cost of cardboard, we need to first find the area of cardboard and then multiply it to the cost.
So, the surface are of an open cuboidal box = Total surface area - area of the top
= 2(lb + bh + hl) - lb
= 2(bh + hl) - lb
= 2(5x3 + 3x10) - 10x5
= 2 x 45 - 50 
= 90 - 50
= 40 cm²
Therefore, the cost of the cardboard = 40 x 50
= 200 paisa
= Rs 2

Hope it helps !!
0