* **G1 (Total sales):** $110,000
* **1A (GST on sales):** $10,000 (Calculated as $110,000 ÷ 11)
* **1B (GST on purchases):** $6,000 (Calculated as $66,000 ÷ 11)
* **W2 (Amounts withheld from wages):** $8,000 (Calculated as $40,000 × 20%)
* **Net amount payable to the ATO:** $12,000 (Calculated as ($10,000 - $6,000) + $8,000)