Question 731962
.07X+.04(7000-X)=391
.07X+280-.04X=391
.03X=391-280
.03X=111
X=111/.03
X=$3,700 WAS INVESTED @ 7%
7000-3700=$3300 WAS INVESTED @ 4%
PROOF:
.07*3700+.04*3300=391
259+132=391
391=391