SOLUTION: Susan invests 3 times as much money at 5% as she does at 4% . If her total interest after 1 year is $570 , how much does she have invested at each rate?

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Question 847053: Susan invests 3 times as much money at 5% as she does at 4% . If her total interest after 1 year is $570 , how much does she have invested at each rate?
Answer by ewatrrr(24785) About Me  (Show Source):
You can put this solution on YOUR website!
 

Hi,

Susan invests 3  times as much money at 5%  as she does at amount+highlight_green%28x%29  4% 

Question states***  interest after 1  year is $570 

 .05(3x) + (.01)x = 570

  .15x + .01x = $570

    .16x = $570

       x = $3562.50 at 1%   and $10,687.50 at 5%  (3 times as much)