SOLUTION: $5400 is invested, part of it at 10% and part of it at 7%. For a certain year the total yield is $528. How much was invested at each rate?

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Question 675135: $5400 is invested, part of it at 10% and part of it at 7%. For a certain year the total yield is $528. How much was invested at each rate?
Answer by sachi(548) About Me  (Show Source):
You can put this solution on YOUR website!
let $x is invested at 10% and $(5400-x)is it at 7%
so the total yield is
10x/100+7(5400-x)/100=528
or 10x+37800-7x=52800 multiplyig 100 on both sides
or 3x=52800-37800=15000
or x=5000
so $5000 is invested at 10% and $400 is it at 7%
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