Answer:
$280
Explanation:
We know that 140 fall in the category of 100 - 200 which offers a discount of
20%
the cost of one box is $2.5
the cost of 140 boxes= 140*2.5
the cost of 140 boxes=$350
Now we have to solve for the discount
=(20/100)*350
=0.2*350
=$70
Final price will be $350-$70= $280