2.266 expressing percentages

Fractions are often given in a special form as a number of hundredths. This type of fraction is called a percentage. For example, 'three hundredths', expressed as a percentage, is 'three per cent'. It can also be written as 'three percent' or '3%'. 'A half' can be expressed as 'fifty per cent', 'fifty percent', or '50%'.

You can use percentages on their own as noun groups when it is clear what they refer to.