SOLUTION: A total of $4000 was invested, part of it at 8% interest and the remainder at 9%. If the yearly interest amounted to $350, how much was invested at each rate?

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Question 623247: A total of $4000 was invested, part of it at 8% interest and the remainder at 9%. If the yearly interest amounted to $350, how much was invested at each rate?
Answer by ewatrrr(24785) About Me  (Show Source):
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Hi,  ·

A total of $4000 was invested, parthighlight%28x%29 of it at 8% interest and the remainder at 9%.  

If the yearly interest amounted to $350, how much was invested at each rate?

 .08·x + .09($4000-x)= $350

            -.01·x = $350 - $360

                 x = -$10/-.01

                 x = $1000, amount at 8%,  $3000 the amount at 9%

and

CHECKING our Answer***

  $80 + $270 = $350