1. **State the problem:** We want to find how many single-sauce boxes of nachos are available given the options. 2. **Identify the options:** - Sizes: small, medium, large (3 options) - Sauces: 4 different choices (1 sauce per box) - Extra cheese: either added or not (2 options) 3. **Use the counting principle:** The total number of combinations is the product of the number of choices for each independent option. 4. **Calculate:** $$\text{Total} = 3 \times 4 \times 2$$ 5. **Simplify:** $$\text{Total} = 12 \times 2 = 24$$ 6. **Interpretation:** There are 24 different single-sauce boxes of nachos available when considering size, sauce choice, and extra cheese option.