SOLUTION: Sam invests the earnings of $3000 from her full-time job. She invests part of the money at 5%/year, and the rest at 4%/year. After one year, these investments earn $140 simple inte

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Question 1093364: Sam invests the earnings of $3000 from her full-time job. She invests part of the money at 5%/year, and the rest at 4%/year. After one year, these investments earn $140 simple interest. How much did she invest at each rate?

Answer by richwmiller(17219) About Me  (Show Source):
You can put this solution on YOUR website!
make two equations
one equation using the amount invested
the second equation with the interest earned by those investments
first x+y=3000
second .05x+.04y=140
now solve them