Let's break down your question into **two steps** and explain the reasoning at each stage. --- ### **Step 1: Understanding What You Want to Total and How** From the left table (highlighted in yellow), you are dealing with: - The number of late transactions, - The total number of transactions, - The delay rates for six departments. **Your "total" row** at the bottom is asking for the totals under each column (department). #### **Explanation:** To find the total number of late transactions or the total number of transactions, you should **add** the numbers for each department across columns. - For example, the **total number of late transactions** for all departments = 40 + 10 + 64 + 11 + 16 + 0 = **141**. **Multiplication** is not appropriate here, because you are summing up counts from different departments, not scaling a single value. --- ### **Step 2: Delay Rate Calculation** For **delay rates**, you are already using the correct formula: - Delay rate for each department = (Number of late transactions / Total number of transactions) × 100 If you want the **overall delay rate** for all departments together, you should: 1. Add up the total late transactions across all departments. 2. Add up the total number of transactions across all departments. 3. Use the formula: (Total late transactions / Total number of transactions) × 100 #### **Explanation:** Again, use **addition** to find the totals, then do **division** for the rate. **Do not multiply** individual percentages or counts. --- ### **Final Answer** - **Use addition** to find the totals for "number of late transactions" and "total number of transactions." - **Use division** (not multiplication) to get the delay rate. - **Multiplication is not correct** for finding these totals; addition is the right method. **Summary:** > **Your method should use addition for totals, and the delay rate should be calculated by dividing the total late transactions by the total number of transactions, then multiplying by 100. Multiplication is not correct for totaling these values.**