Reverse percentage

Definition

A calculation that works backwards from a final value and a percentage change to find the original value.

Used by Edexcel and OCR

Specification R9 · Paper 1, Paper 2, Paper 3

Sometimes the final value and the percentage change are known, but the starting value is missing. This is a reverse percentage problem.
Revise: Percentage Change and Original Value Problems

Specification 2.03c · Paper 1 (Foundation), Paper 2 (Foundation), Paper 3 (Foundation), Paper 4 (Higher), Paper 5 (Higher), Paper 6 (Higher)

A method of finding an original quantity when its value after a percentage change is known.

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