Acceptance Rate

The mean number of students has changed, so how many students applied to a school?
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Problem



The mean number of students accepted by a school in the four years 2007 to 2010 was 325.

The mean number of students accepted by the school in the five years 2007 to 2011 was 4% higher.

How many students did this school accept in 2011?

This problem is taken from the UKMT Mathematical Challenges.