Question 352279
.15x+.10(7,000-x)=720
.15x+700-.10x=720
.05x=720-700
.05x=20
x=20/.05
x=400 amount invested @ 15%.
7,000-400=6,600 amount invested @ 10%
Proof:
.15*400+.10*6,600=720
60+660=720
720=720