# Find the cost of cardboard required to make a closed box of length 28cm,Breadth 0.5 m and 0.2m at Rs 2.5 per meter sq

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breadth = 0.5 m

height = 0.2 m

total surface area = 2(lb+bh+hl)

=2( 0.28 ×0.5 +0.5×0.2 +0.2 ×0.28)

= 2(0.14 +0.1 +0.056)

= 2 ×0.296

= 0.592 m²

Cost of cardboard = 0.592 × 2.5

=rupees 1.48