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berapa total belanja masing-masing customer dengan menggunakan rumus gabungan sumproduct dan vlookup

To calculate the total spending for each customer using the **SUMPRODUCT** and **VLOOKUP** functions in Excel, you need to combine data from the two sheets visible in the images: "Data Penjualan" and "Daftar Harga Barang." Here's how you can do it:

### Steps to create the formula:

1. **VLOOKUP**: This will retrieve the price of each item from the "Daftar Harga Barang" sheet based on the item codes used in the "Data Penjualan" sheet.
2. **SUMPRODUCT**: This will calculate the total spending for each customer by summing the product of the quantities and prices.

### Formula to calculate total spending for each customer:

Assuming the following:
- The first sheet (Data Penjualan) lists customer purchases in rows (like in columns C to Z).
- The second sheet (Daftar Harga Barang) has the prices in column D.

#### Steps:
1. **Add a helper column in the Data Penjualan sheet**:
   - In the first empty column (e.g., Column AA), insert a **VLOOKUP** formula to get the price for each item. 
   - The formula for the first item (say, for customer in row 3) would look something like this:
     ```excel
     =VLOOKUP(D3, 'Daftar Harga Barang'!$B$3:$D$26, 3, FALSE)
     ```
     This looks for the code in column D3 in the "Daftar Harga Barang" sheet (range $B$3:$D$26) and returns the price from the third column of that range (column D).

2. **Apply the VLOOKUP for each item the customer has purchased**, using this format for each corresponding code.

3. **SUMPRODUCT**: Once you have the prices pulled in using VLOOKUP, you can use SUMPRODUCT to calculate the total amount spent for each customer. 
   - Example:
     ```excel
     =SUMPRODUCT(E3:X3, AA3:AB3)
     ```
     This multiplies each quantity from the purchase table (E3 to X3) with the corresponding prices from the VLOOKUP column (AA3:AB3) and sums up the result for each customer.

4. **Repeat** the same formula for all customers.

### Detailed Formula for a customer:

Assume that:
- **E3:Z3** contains the quantity of products purchased by the customer (like in row 3).
- **'Daftar Harga Barang'!$B$3:$D$26** is the price list.

You can create a formula to calculate the total amount using:

```excel
=SUMPRODUCT(E3:Z3, VLOOKUP(E3:Z3, 'Daftar Harga Barang'!$B$3:$D$26, 3, FALSE))
```

However, since **VLOOKUP** does not natively handle arrays (E3:Z3), it’s more practical to use the helper column approach.

### Questions for Further Exploration:
1. Do you need help automating this for all customers in one step?
2. Should we categorize the customers based on total spending?
3. Would you like to know how to format this result in a separate summary table?
4. Do you need instructions on creating a pivot table for these customers?
5. How should we handle errors if some customers have missing data?

### Tip:
Ensure that both sheets are correctly formatted, especially for the product codes, so that the **VLOOKUP** function can accurately find the prices.

Learn how to calculate the total spending of each customer using Excel's SUMPRODUCT and VLOOKUP functions, combining item prices and purchase quantities.

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