Answer:
The best unit price is Brand A.
Step-by-step explanation:
We can find the cost for each roll of toilet paper. For Brand A, we can do 49/7, which we get 7. That means that every roll of toilet paper cost $7 for Brand A. For Brand B, we do 72/9 and get 8. That means every roll of toilet paper cost $8 for Brand B. Since Brand A is cheaper per roll, Ariana should buy from that brand.
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