How many square feet could be treated with one gallon if the application rate is 4 ounces per 100 square feet?

To determine how many square feet can be treated with one gallon when the application rate is 4 ounces per 100 square feet, we start by recognizing that there are 128 ounces in one gallon.

First, we find out how many 4-ounce increments are in the entire gallon:

[

\text{Number of 4-ounce applications in 1 gallon} = \frac{128 \text{ ounces}}{4 \text{ ounces/application}} = 32 \text{ applications}

]

Next, since each application covers 100 square feet, we calculate the total area that can be treated:

[

\text{Total area} = 32 \text{ applications} \times 100 \text{ square feet/application} = 3,200 \text{ square feet}

]

This calculation shows that one gallon can effectively treat 3,200 square feet at the specified application rate of 4 ounces per 100 square feet. Thus, this confirms that the correct answer is indeed 3,200 square feet.