Their error is that they divided 12 by 30, instead of 30 by 12 in order to get the price per pair
the correct unit price is $2.50 per pair
2.5 * 12 = 30
The answer is 8.6 units.
To solve this problem you use the distance formula.
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The quotient of 675 and 5 would be 135.
675/5=135
Hope this helps!
