1. **State the problem:**
We need to find the total cost of purchasing 84 lunch boxes, each costing 6.45.
2. **Formula used:**
Total cost = Number of lunch boxes \( \times \) Cost per lunch box
3. **Apply the values:**
Total cost = 84 \( \times \) 6.45
4. **Calculate the multiplication:**
$$84 \times 6.45 = 541.80$$
5. **Interpretation:**
The total cost for 84 lunch boxes is 541.80.
6. **Answer:**
The correct choice is 541.80.
Lunch Box Cost 60B4Ad
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