Question 1107868
x is 2%
y=3%
z=4%
but z=y-8000
Therefore,
x+y+y-8000=48000
x+2y=56000
.02x+.03y+.04(y-8000)=1550
.02x+.03y+.04y-320=1550
.02x+.07y=1870
x+2y=56000
multiply the top by -50
-x-3.5y=-93500
add
-1.5y=-37500
y=25000@3%=$750
y-8000=17000@4%=$680
remaining is x
6000@0.02 for $120

invested 
$6000 at 2%
$25000 at 3%
$17000 at 4%