Organic milk costs $2.52 per half gallon. At this rate, how can the price of 4 gallons of organic milk be determined?

There are 2 half-gallons in 1 gallon, so first find the unit price per gallon: $2.52 × 2 = $5.04. Then multiply $5.04 by 4 gallons to determine the total price. So the correct choice is finding the unit price and multiplying it by 4.

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