To determine how much Maria will save per ounce by selecting the less expensive option, we first need to calculate the price per ounce for both the 12-ounce bag and the 60-ounce container.
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Calculating the price per ounce for the 12-ounce bag: \[ \text{Price per ounce} = \frac{\text{Total price}}{\text{Total ounces}} = \frac{2.40}{12} = 0.20 \text{ dollars per ounce} \]
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Calculating the price per ounce for the 60-ounce container: \[ \text{Price per ounce} = \frac{\text{Total price}}{\text{Total ounces}} = \frac{18.00}{60} = 0.30 \text{ dollars per ounce} \]
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Finding the savings per ounce: Maria will save by choosing the cheaper option, which is the 12-ounce bag at $0.20 per ounce compared to the 60-ounce container at $0.30 per ounce. The savings can be calculated as follows: \[ \text{Savings per ounce} = \text{Price per ounce of 60-ounce container} - \text{Price per ounce of 12-ounce bag} = 0.30 - 0.20 = 0.10 \text{ dollars per ounce} \]
Therefore, Maria will save $0.10 per ounce by selecting the less expensive 12-ounce bag instead of the 60-ounce container.