To determine which yogurt purchase is the best deal, we need to calculate the price per ounce for each option.
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40 ounces for $3.20: \[ \text{Price per ounce} = \frac{3.20}{40} = 0.08 \text{ dollars per ounce} \]
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28 ounces for $2.16: \[ \text{Price per ounce} = \frac{2.16}{28} = 0.07714 \text{ dollars per ounce} \]
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6 ounces for $0.66: \[ \text{Price per ounce} = \frac{0.66}{6} = 0.11 \text{ dollars per ounce} \]
Now, we compare the price per ounce for each option:
- 40 ounces: $0.08 per ounce
- 28 ounces: $0.07714 per ounce
- 6 ounces: $0.11 per ounce
The best deal is the one with the lowest price per ounce, which is the 28 ounces for $2.16 at $0.07714 per ounce.
So, the 28-ounce yogurt at $2.16 is the better deal.