Use the conversion that 1 ounce is approximately 28.35 grams to calculate the unit price per ounce for 283.5 grams at $5.48.

Convert the total mass to ounces: 283.5 ÷ 28.35 = 10 ounces. Then divide the $5.48 total price by 10 ounces to get $0.548 per ounce, which rounds to $0.55. The correct choice is $0.55 per ounce.

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