Question 901648
x+y=25000,
0.1*x+0.09*y=2430
x=25000-y
0.1*(25000-y)+0.09*y=2430
2500-0.1y+0.09*y=2430
-0.01*y=-70
y=7000 at 9%
x=25000-y
x=18000 at 10%
check
0.1*18000+0.09*7000=2430
1800+630=2430
2430=2430
ok