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$0.03
To find the cost per ounce for the 6-ounce box:
Cost = $0.90
Cost per ounce = $0.90 / 6 ounces = $0.15 per ounce
To find the cost per ounce for the 3-ounce box:
Cost = $0.42
Cost per ounce = $0.42 / 3 ounces = $0.14 per ounce
Difference in cost per ounce between the larger and smaller boxes:
$0.15 per ounce - $0.14 per ounce = $0.01 per ounce
Therefore, the difference in cost per ounce between the larger and smaller boxes is $0.01.