2500( 1+a)^2=3025
A=0. 1 (negative rounding)
(2) Let the house area be X and the savings be Y in 2009.
The total house price in 2009 was 2500* 12*8=240000.
In 2009, the unit price of the house was 240,000/x.
The unit price of 20 1 1 year is (2/3) * (240000/x) =160000/x.
The total house price for 20 1 1 year is (160000/x)*(x+ 10).
20 1 1 annual savings is y+3000.
The decoration fee for 20 1 1 year is 1800(x+ 10).
Then, 240000+120000+750x = y+2000000.
2000000+[ 1600(x+ 10)]/x = y+30000+200000 & lt； 2 & gt
The final solution is x=80.
I bought a 90m^2 house with a total price of 6.5438+0.8 million yuan.