Answer:
Brand A
Explanation:
If you divide both brands to find how much one can costs, brand B costs more per can.
79 ÷ 3 = 26.34
87 ÷ 4 = 21.75
That being said, if brand B were to sell 4 cans instead of 3 it would be more than brand A's 4 cans. Brand A is cheaper than brand B would be.