SOLUTION: A man invested $12,500. Part at 6%, part at 4.5%. How much did he invest at each rate if the total interest earned for the year was $685.50?

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Question 231540: A man invested $12,500. Part at 6%, part at 4.5%. How much did he invest at each rate if the total interest earned for the year was $685.50?
Answer by rfer(16322) About Me  (Show Source):
You can put this solution on YOUR website!
.06x+.045(12500-x)=685.50
.06x+562.50-.045x=685.50
.015x=123
x=$8200 at 6%
$4300 at 4.5%