Please help!!!! It’s #14 and explain and show me how to do it please

Bottled juice: unit cost per liter:
$2.80 / 2 liters = $1.40 per liter
Boxed juice: unit cost per liter:
$3.90 / [6*12 liters] = $0.054 per liter
The first option, $1.40, is much more expensive than the second option (5 cents per liter).