Question

the dimension of a box are 20 multiply 14 into 9 find total cost incurred to make 15 such boxes at the rate of rs 40per meter 2

Answer 1

hi buddy here is ur answer:
l = 20
b= 14
h=9
TSA OF BOX =L×B×H
I.e.20×14×9=280
for making 15 such boxes:280×15=4200
therefore: making 15 such boxes it costs rs 4200

Answer 2

tsa=2(lb+bh+hl)
$= 2((20)(14) + (14)(9) + (9)(20)) \\ 2(280 + 126 + 180) \\ = 2 \times 586 \\ = 1172$
15×1172 = 17580 =tsa of 15 boxes
cost=17580/40=Rs.439.50

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