SOLUTION: I need help please Sam invested a certain amount of money at 2.5% and $1800 more at 4%. The annual interest that he earned was $150. How much did he invest at 4%?

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Question 839029: I need help please
Sam invested a certain amount of money at 2.5% and $1800 more at 4%. The annual interest that he earned was $150. How much did he invest at 4%?
Answer by ewatrrr(24785) About Me  (Show Source):
You can put this solution on YOUR website!
 

Hi,

Sam invested a certain amount of moneyhighlight_green%28x%29  at 2.5% and $1800 more at 4%.

Question states***The annual interest that he earned was $150.

*** .025x+%2B+.04%28x%2B1800%29+=+150

 .025x+%2B+.04x%2B+72+=+150

       .065x+=+78

              x = $1200, amt at 2.5%

Amount invested at 4% was $3000.    ($1200+ $1800)

CHECKING our answer***

 .025%2A1200+%2B+.04%2A3000%29 = $30 + $120 =  $150

Wish You the Best in your Studies.