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MathMentor

Learn with Mentor · 7 min

GST, Discounts and Mark-ups

Learn how mark-ups add to a cost and discounts subtract from a price, using percentages.

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Prices go up, and prices go down

Retail prices change in two common ways — a store marks a price up to sell for a profit, or discounts it to attract buyers. Both use the same percentage skill, in opposite directions.