Greetings!
First Poster:
9/2=4.5
4.5/24=0.1875
One can would cost approximatly 0.19 dollars at the first store.
Second Poster:
10/4=2.5
2.5/12=0.208333333
One can would cost approximately 0.21 dollars at the second store.
Third Poster
9/3=3
3/12=0.25
One can would cost 0.25 dollars at the third store.
The first store has the best value for lemonade.
Hope this helps.
-Benjamin