Question: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?
Answers:
. That's a pretty simple algebra calculation EXCEPT for one thing. There are 2 unknowns, t and f. Therefore you need 2 equations, and we don't have that.
I hope this isn't YOUR homework?
....(1.) .03x(18,000-t) + .05x(18,000-f) = 660.
..(2.) ? .
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