Question 901375
x+y=30000,
0.07*x+0.08*y=2210
x=30000-y
0.07*(30000-y)+0.08*y=2210
2100-0.07y+0.08*y=2210
0.01*y=110
y=11000 at 8%
x=30000-y
x=19000 at 7%
check
0.07*19000+0.08*11000=2210
1330+880=2210
2210=2210
ok