Question 405945
6% per annum ------  x
4% per annum--------y

x+y =22,000....1

0.06x+0.04y=$1080. 
multiply by 100
6x+4y=108000............(2)

multiply (1)-6
-6x-6y=-132000
add to (2)
-2y=-24000
/2
y = $12000 ===> at 4%
Balance $10,000 ay 6%