To find the best deal based on unit price, we need to calculate the price per ounce for each size of ketchup bottle. Here's the calculation for each size:
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10 oz. bottle at $2.50: \[ \text{Unit Price} = \frac{2.50}{10} = 0.25 \text{ per ounce} \]
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14 oz. bottle at $2.80: \[ \text{Unit Price} = \frac{2.80}{14} \approx 0.20 \text{ per ounce} \]
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16 oz. bottle at $4.00: \[ \text{Unit Price} = \frac{4.00}{16} = 0.25 \text{ per ounce} \]
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18 oz. bottle at $5.40: \[ \text{Unit Price} = \frac{5.40}{18} = 0.30 \text{ per ounce} \]
Now let's summarize the unit prices:
- 10 oz. bottle: $0.25 per ounce
- 14 oz. bottle: $0.20 per ounce
- 16 oz. bottle: $0.25 per ounce
- 18 oz. bottle: $0.30 per ounce
The 14 oz. bottle at $2.80 has the lowest unit price at $0.20 per ounce, making it the best deal.