Question 107855
.18X+.04(17,000-X)=1,380
.18X+680-.04X=1,380
.14X=1,380-680
.14X=700
X=700/.14
X=5,000 INVESTED @ 18%
17,000-5,000=12,000 INVESTED @ 4%.
PROOF
.18*5,000 +.04*12,000=1,380
900+480=1,380
1,380=1,380