According to the meaning of the question, 20 12 is 2500( 1+x), and 20 13 is 2500 (1+x).

Then 2500 (1+x) (1+x) = 3600,

The solution is x=0.2 or x=-2.2.

Therefore, the average growth rate of education funds in these two years is 20%, and the education funds to be invested in this city in 20 12 years are: 2500 (1+20%) = 30 million yuan.

So the answer is: 3000.