1. **State the problem:** Cheng builds cabinets costing $33 each and sells them for $41. We need to find Cheng's current dollar margin per unit. 2. **Formula for dollar margin:** Dollar margin per unit is calculated as: $$\text{Dollar Margin} = \text{Selling Price} - \text{Cost Price}$$ 3. **Apply the values:** $$\text{Dollar Margin} = 41 - 33$$ 4. **Calculate:** $$\text{Dollar Margin} = 8$$ 5. **Interpretation:** Cheng currently makes 8 dollars profit per cabinet sold before considering other expenses. **Final answer:** $8$ dollars margin per unit.