To find the least cost per ounce, we must find the cost of each one
The first data in the table is 12 ounces cost 1.20 dollars
The cost per ounce = cost / ounce

The cost per ounce = 0.1 dollar
The second data in the table is 16 ounces cost 1.79 dollars

The cost per ounce = 0.111875 dollars
The third data in the table is 28 ounces cost 2.70 dollars

The cost per ounce = 0.09643 dollars
The fourth data in the table is 30 ounces cost 3 dollars

The cost per ounce = 0.1 dollars
Then the least on is the 3rd one
The least cost is 0.09643 dollar per pound ====== 3rd data in the tab