Answer: $32 to buy the 8 additional packs.
Explanation
First, we must find how much it is to get one pack of juice boxes:
48/12 = 4
This tells us that for one pack at this store, it is for $4.
Next, multiply the money by eight to get the amount of money for 8 packs:
4 ยท 8 = 32
Now we know that to buy 8 more packs of juice boxes, Lisa has to pay $32 more.