1. **State the problem:** We need to find the unit cost when the total cost for 3 items is 25. 2. **Formula:** The unit cost is calculated by dividing the total cost by the number of items. $$\text{Unit cost} = \frac{\text{Total cost}}{\text{Number of items}}$$ 3. **Substitute the values:** $$\text{Unit cost} = \frac{25}{3}$$ 4. **Calculate:** $$\text{Unit cost} = 8.3333...$$ 5. **Interpretation:** Each item costs approximately 8.33 when the total cost for 3 items is 25.