SOLUTION: Janet invested $27,000, part at 15% and part at 9%. If the total interest at the end of the year is $3,390, how much did she invest at 15%?

Algebra ->  Coordinate Systems and Linear Equations  -> Linear Equations and Systems Word Problems -> SOLUTION: Janet invested $27,000, part at 15% and part at 9%. If the total interest at the end of the year is $3,390, how much did she invest at 15%?      Log On


   

Question 111000: Janet invested $27,000, part at 15% and part at 9%. If the total interest at the end of the year is $3,390, how much did she invest at 15%?
Answer by scott8148(6628) About Me  (Show Source):
You can put this solution on YOUR website!
let x="amount @ 15%", so 27000-x="amount @ 9%" ___ x(15%)+(27000-x)(9%)=3390

.15x+2430-.09x=3390