Question 105817
.03X+.05(3X)=7200
.03X+.15X=7,200
.18X=7,200
X=7,200/.18
X=40,000 IS THE AMOUNT INVESTED @ 3%
3*40,000=120,000 INVESTED @ 5%
PROOF
.03*40,000+.05*120,000=7200
1,200+6,000=7,200
7,200=7,200