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MathMentor

Learn with Mentor · 8 min

GST, Discounts, and Mark-Ups

Find a percentage of a dollar amount, then add it for mark-ups, subtract it for discounts, or use 10% for GST.

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Percent changes in money

Consumer maths often asks how a price changes. A discount lowers the price, a mark-up raises the price, and GST in Australia is 10% of the relevant amount.