**Answer:**

6 four-packs.

**Step-by-step explanation:**

My reasoning for 6 four-packs is that, the shopper needs 24, right? And if that shopper buys 6 four-packs it'll be cheaper than the larger package. The 6 four-packs come to a cost of $20.04. But the 4 six-packs will come out as $21.12. The shopper will be able to save $1.08 :)

**Answer:**

**Step-by-step explanation: Use pascal triangle or foil method**

First you subtract three from three and -29 then you divide that by -2