To solve this you need to calculate the cost per milliliter of both juices.
355ml costs 1.25. So if you divide the 1.25 by 355ml you will get the cost of 1 ml
The second you will have to convert L to ml by multiplying the L by 1000 (move decimal 3 places right)
use this value to calculate same as before.
find the difference between the two 1ml values to calculate your savings.