









Calculating GST in an Amount 










For a single GSTinclusive amount, multiply by 3 and then divide 23 to get the GST component. (If something costs $100 including GST, $100 multiplied by 3 = $300 divided by 23 = $13.04, which is the GST included) To add GST to an amount, multiply it by 15% (0.15). 








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