To find out which size has the lower unit price, we need to compare the unit prices of each size. Unit price is the price per ounce or unit of a particular item.
For the first size, the ice cream costs $4.50 for 48 ounces. To find the unit price, we need to divide the total price by the number of ounces:
Unit price = Total price / Number of ounces
Unit price = $4.50 / 48 oz
Unit price = $0.09375/oz
For the second size, the ice cream costs $7 for 128 ounces:
Unit price = Total price / Number of ounces
Unit price = $7 / 128 oz
Unit price = $0.0546875/oz
For the third size, the ice cream costs $3 for 64 ounces:
Unit price = Total price / Number of ounces
Unit price = $3 / 64 oz
Unit price = $0.046875/oz
Comparing the unit prices:
First size: $0.09375/oz
Second size: $0.0546875/oz
Third size: $0.046875/oz
Comparing the unit prices, we can see that the third size, which costs $3 for 64 ounces, has the lowest unit price of $0.046875/oz. Therefore, the third size has the lower unit price among the three sizes.