SOLUTION: the computer club invested $2200, part at 4.5% interest and the rest at 7%. the total annual interest earned was $144. how much was invested at each rate?

Algebra ->  College  -> Linear Algebra -> SOLUTION: the computer club invested $2200, part at 4.5% interest and the rest at 7%. the total annual interest earned was $144. how much was invested at each rate?      Log On


   

Question 232262: the computer club invested $2200, part at 4.5% interest and the rest at 7%. the total annual interest earned was $144. how much was invested at each rate?
Answer by rfer(16322) About Me  (Show Source):
You can put this solution on YOUR website!
.045x+.07(2200-x)=144
.045x+154-.07x=144
-.025x=-10
x=$400 at 4.5%
$1800 at 7%