1. **State the problem:** We need to forecast lunch sales for the upcoming week using a three-week moving average based on past sales of 2200, 2400, and 2000. 2. **Formula:** The three-week moving average forecast is calculated as: $$\text{Forecast} = \frac{\text{Sales Week 1} + \text{Sales Week 2} + \text{Sales Week 3}}{3}$$ 3. **Calculate the sum:** $$2200 + 2400 + 2000 = 6600$$ 4. **Calculate the average:** $$\frac{6600}{3} = 2200$$ 5. **Interpretation:** The forecasted sales for the upcoming week is 2200. Therefore, the correct forecast is **2200**.