Question 121813
.05X+.03(18000-X)=660
.05X+540-.03X=660
.05X-.03X=660-540
.02X=120
X=120/.02
X=6000 AMOUNT INVESTED @ 5%.
18000-6000=12000 INVESTED @ 3%.
PROOF
.05*6000+.03*12000=660
300+360=660
660=660