Percentages and points
A percent is a number or ratio, expressed as a fraction of 100.
Percentages often describe shares or changes.
- Say 15% of shirts are blue. That means: for every 100 shirts, 15 are blue.
- An increase of £1 on a price of £4 is: 1/4, equal to 0.25. As a percentage, that is a 25% increase.
In one use, a percentage change is about the relative change between two values. Sometimes, we need to show changes…