How to find the original price after a discount or increase
In short: When you know the final price but not the starting amount, you need reverse percentages. This video demonstrates how to work backward from a new value to find the original cost.
The tutorial covers the fundamental logic of reverse percentages by treating the original value as 100%. It explains how to relate a new, adjusted value to its corresponding percentage of the original. You will learn methods for calculating the starting price when given a percentage change, as well as how to find the original value when you only have the actual change in amount and the percentage rate.
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Sources
- Summary by Intellect · source: GCSE Maths - Reverse Percentages - Calculating The Cost Before The Discount (2026/27 exams)
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