Let x=rate invested at 5%.
Then the rate invested at 2% is 25,000-x

You have: 0.05x+0.02(25,000-x)=980

0.05x+500-0.02x=980

0.03x+500=980

0.03x=480

x=16000

$16,000 was invested at 5% and 9,000 at 2%.