SOLUTION: The sum of $4000 is invested, part at 6% intrest and the rest at 4%. If the annual combined intrest is $222, how much is invested at each rate?

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Question 447488: The sum of $4000 is invested, part at 6% intrest and the rest at 4%. If the annual combined intrest is $222, how much is invested at each rate?
Answer by jorel1380(3719) About Me  (Show Source):
You can put this solution on YOUR website!
m+n=4000
.06m+.04n=222
6m+4n=22200
4m+4n=16000
2m=6200
m=3100
n=900
$3100 was invested at 6%, $900 was invested at 4%..