# GST Calculation

**Invoice total (GST-inclusive):** $1,100.00

## Working

The GST-inclusive price equals the GST-exclusive price × (1 + 0.10) = GST-exclusive price × 1.1

Therefore:

- **GST-exclusive price** = $1,100 ÷ 1.1 = **$1,000.00**
- **GST amount** = $1,100 − $1,000 = **$100.00**

## Answers

**(a) GST amount included in the invoice: $100.00**

**(b) GST-exclusive price: $1,000.00**