IGCSE Maths / Ratios and percentages
Reverse percentage and compound interest problems revision notes
Edexcel International GCSE Maths (4MA1), chapter 2: Ratios and percentages, specification point 1.6b. Part of the full course.
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Reverse percentage problems give you the amount after a change and ask for the amount before it. You work backwards by dividing by the multiplier, including when the change happens over several years.