SOLUTION: Angus invested $18,000, part at 3% and part at 5%. If the total interest at the end of the year is $660, how much did he invest at each rate?

Algebra ->  Equations -> SOLUTION: Angus invested $18,000, part at 3% and part at 5%. If the total interest at the end of the year is $660, how much did he invest at each rate?      Log On


   

Question 44576: Angus invested $18,000, part at 3% and part at 5%. If the total interest at the end of the year is $660, how much did he invest at each rate?
Answer by Nate(3500) About Me  (Show Source):
You can put this solution on YOUR website!
0.03%28x%29+%2B+0.05%2818000+-+x%29+=+660
0.03x+%2B+900+-+0.05x+=+660
-0.02x+=+-240
x+=+12000
18000+-+x+=+18000+-+12000+=+6000
$12,000 in 3%
$6,000 in 5%