1. **State the problem:** Christopher's meal costs 36.00 and he wants to leave a 10% tip. We need to find the total bill including the tip. 2. **Formula used:** The total bill including tip is calculated as: $$\text{Total} = \text{Meal Cost} + \text{Tip}$$ where $$\text{Tip} = \text{Meal Cost} \times \text{Tip Percentage}$$ 3. **Calculate the tip:** $$\text{Tip} = 36.00 \times 0.10 = 3.60$$ 4. **Calculate the total bill:** $$\text{Total} = 36.00 + 3.60 = 39.60$$ 5. **Explanation:** Christopher should leave a tip of 3.60, making his total bill 39.60 including the tip. **Final answer:** The total bill including the 10% tip is 39.60.