Question 188371
let x and y be the amount invested at 8.5% and 6.4 % respectively
:
x+y=8000............eq 1
.085x+.064y=575.....eq 2
:
rewrite eq 1 to x=8000-y and plug it into eq 2
:
.085(8000-y)+.064y=575
:
680-.085y+.064y=575
:
-.021y=-105
:
y=5000 invested at 6.4%
:
x=8000-5000=3000 invested at 8.5%