Question 142993
.09X+.08(9,000-X)=770
.09X+720-.08X=770
.01X=770-720
.01X=50
X=50/.01
X=$5,000 FOR THE INVESTMENT @ 9%.
9,000-5,000=$4,000 INVESTED @ 8%.
PROOF:
.09*5,000+.08*4,000=770
450+320=770
770=770