Question

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

By multiplying $2.52 by 4.
By dividing $2.52 by 4.
By finding the unit price and multiplying it by 4
By finding the unit price and dividing it by 4.

Answer 1

By finding the unit price and multiplying by four

The first two are forgetting 2.52 is only half a gallon

the last is wrong because you don't divide by 4 because you are adding to the price making it larger and not minmizing the price.

Answer 2

The price of 4 gallons of organic milk be determined by finding the unit price ($2.52 times 2) and multiplying it by 4.