Question 900632
x+y=12000,
0.06*x+0.08*y=880
x=12000-y
0.06*(12000-y)+0.08*y=880
720-0.06y+0.08*y=880
0.02*y=160
y=8000 at 8%
x=12000-y
x=4000 at 6%
check
0.06*4000+0.08*8000=880
240+640=880
880=880
ok