Question 712900
.09x+.04(2400-x)=161
.09x+96-.04x=161
.05x=161-96
.05x=65
x=65/.05
x=$1,300 was invested @ 9%.
2400-1300=$1100  invested @ 4%.
Proof:
.09*1300+.04*1100=161
117+44=161
161=161