[Math] How to something be greater than $100\%$

percentages

Apologies, my mathematics is poor but I saw an advert recently which said:

Up to $350\%$ more likely to quit

How can something be greater than $100\%$? It can't be can it?

Best Answer

Say 1 out of 10 people quit in year 1. Now if 4.5 out of 10 people quit in year 2 it is up 350%. Does this make sense? The percentages compare numbers relative to each other.

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