Sum of Sales per Customer / Άθροισμα πωλήσεων ανά πελάτη How the SUMIF Function Works (With Screenshot Callouts) The SUMIF function in Excel lets you add values that meet a specific condition.In this example, it is used to calculate the total sales per customer. 📌 Callout 1: The Raw Data (Left Side of the Image) 👉 Look at the left side of the screenshot Column A shows Customer names Column B shows Sales amounts Some customers appear multiple times, because they made more than one purchase This is typical sales data that is not yet summarized. 📌 Callout 2: The Summary Table (Highlighted in Red) 👉 Look at the red highlighted area in the screenshot This section shows: One row per customer The total sales amount for each customer This is the result we want to calculate automatically using Excel. 📌 Callout 3: The SUMIF Formula (Right Side, Yellow Cells)…