IGCSE Maths / Ratios and percentages
Percentage increase and decrease
Edexcel International GCSE Maths (4MA1), chapter 2: Ratios and percentages, specification point 1.6e-f. Part of the full course.
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A percentage multiplier finds a new amount after an increase or decrease in one step. Using the correct multiplier also helps you avoid confusing the change with the new total.