Using the right prepositions.
1. Use to when describing what happened to the number :
in 2008, the rate of unemploy ment rose to 10%
2. Use by when describing the amount of change between two numbers :
in 2009, the rate of unemployment fell by 2%
(from 10% to 8%).
3. Use with to give the idea of "having" the number :
He won the election with 52% of the vote..
4.Use at to add the number on the end of a sentence:
Unemployment reached its highest level in 2008, at 10%.
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