Question 1101518
y=z
x+y+z=100,000
x+2y=100,000
x=100,000-2y

.04*x+.06*y+.08*z=6100
.04*x+.06*y+.08*y=6100
.04*(100,000-2y)+.14*y=6100
.04*100,000-2y*.04+.14*y=6100
4000-.08*y+.14*y=6100
.06*y=2100
y=2100/.06
y=35,000 at 6%
z=35,000 at 8%
100000-70000=30
x=30,000 at 4%
check
.04*30000+.06*35000+.08*35000=6100
1200+2100+2800=6100
6100=6100
ok