Excel SUM Practice Question: Using SUM, find the final invoice total including 18% GST on the four items…
The question
Using SUM, find the final invoice total including 18% GST on the four items and put it in B7.
The data
| A | B | |
|---|---|---|
| 1 | Item | Amount |
| 2 | Laptop bag | 1850 |
| 3 | Mouse | 650 |
| 4 | Keyboard | 1200 |
| 5 | USB hub | 900 |
| 6 | GST 18% | |
| 7 | Invoice total | ? |
The yellow cell is where your answer goes.
Show answer
Answer in B7: 5428
How it works
Explanation: Adding 18% GST is the same as multiplying the subtotal by 1.18. Wrap the SUM and multiply once.
Syntax: =SUM(B2:B5)*1.18
Subtotal: 1850 + 650 + 1200 + 900 = 4600. With GST: 4600 x 1.18 = 5428.
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=SUM(number1, [number2], ...)
Adds up all the numbers in a range — the most-used formula in Excel. Totaling four quarters of sales into an annual figure. Full SUM guide.
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