How are Percentages Used and Abused?

Percentages are used everywhere. From discounts in shops to stories about the efficacy of a new drug. It is perhaps this widespread usage that makes us so susceptible to misinterpreting them. Of course retailers want you to think you're getting a better deal than you are. But it is always a good idea to think carefully about any percentage presented to you and work out what it means.

Let's be curious and ask, 'how are percentages used?'