We first convert 1.5 Liters of bottled juice to units of ounce so we can compare the two.
1.5 L plastic bottled juice ( 34 oz / 1 L) = 51 oz of plastic bottled juice
We then divide the prices of each juice to their corresponding volume to get a units of dollars per ounce.
$4.20 / 60 oz of glass bottled juice = 0.07 dollars per ouce of glass bottled juice
$3.06 / 51 oz of plastic bottled juice = 0.06 dollars per ounce of plastic bottled juice
Thus, the answer is b. The plastic bottled juice is cheaper by 1 cent compared to the glass bottled juice.
