Answer:
The local drugstore
Explanation:
The local drugstore sells 10 boxes for 7.50. You would do 10/7.50 = 1.34
The local drugstore sells every box for 1.34
The warehouse sells 30 boxes for 22.00. 30/22 = 1.36. Each box at the warehouse cost 1.36
The local drugstore is cheaper and a better sale. The drugstore is 0.02 cheaper.