Answer:
The best deal is offered by the Store Z, 50 cents per can.
Explanation:
To find the best deal, we have to divide to know how much each store is charging for a single can.
Store X:

Store Y:

Store Z:
Offers 50 cents per can.
If we compare, the last store offers the best deal, the same brand, the same size for a lower price. The Store X offers the highest price, and the Store Y offers the middle price, it's in between.
Therefore, the best deal is offered by the Store Z, 50 cents per can.