SOLUTION: Carla invested $28,000, part at 14% and part at 9%. If the total interest at the end of the year is $3,370, how much did she invest at 14%?

Question 105784: Carla invested $28,000, part at 14% and part at 9%. If the total interest at the end of the year is $3,370, how much did she invest at 14%?
Answer by Fombitz(32388) (Show Source): You can put this solution on YOUR website!
F-amount invested at 14%
N-amount invested at 9%
Total amount = F + N = $28000
1.
Interest at 14% plus Interest at 9% = Total interest = $3370.
2.
Use equation 1. to solve for F in terms of N,
1.

Substitute your result into equation 2.
2.

Check your answer.
1.

Good answer.
2.

Good answer.
$17,000 at 14% and $11,000 at 9%.
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