Q. 285.0( 1 Vote )

A metal box with

Answer :

Let x be the length and breadth of the box and height be y.

Volume = V = x2y = 1024

Total cost of top and bottom = 2 × x2 × 5 = 10x2

Total cost of sides = 4 × xy × 2.5 = 10xy

Total cost

The cost of the box is minimum when x = 8 cm.

Total cost = Rs. 1920

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