To answer this question, we need to use the concept of unit ratio. We need to divide the price by the total ounces of the product.
In this case, we have that 15.5oz of a product costs $4.79. Then the price per ounce is as follows:
![\frac{\text{Cost}}{\text{ounce}}=\frac{\$4.79}{15.5\text{ounces}}](https://img.qammunity.org/2023/formulas/mathematics/college/w236ncqw9rlszq3r51uudutu441s4fuwey.png)
Then, we have:
![\frac{\text{Cost}}{\text{ounce}}=0.309032258065\approx0.31\frac{\$}{\text{ounce}}](https://img.qammunity.org/2023/formulas/mathematics/college/15v6glp6tss823bk4m3gpoge2qnyio82w2.png)
In other words, the cost per ounce is $0.31 per ounce - or 31 cents per ounce.