SOLUTION: Walt made an extra $9000 last year from a part-time job. He invested part of the money at 9% and the rest at 8%. He made a total of $780 in interest. How much was invested at 8%

SOLUTION: Walt made an extra $9000 last year from a part-time job. He invested part of the money at 9% and the rest at 8%. He made a total of $780 in interest. How much was invested at 8%

Algebra.Com

Question 116688: Walt made an extra $9000 last year from a part-time job. He invested part of the money at 9% and the rest at 8%. He made a total of $780 in interest. How much was invested at 8%?
Answer by checkley71(8403) (Show Source): You can put this solution on YOUR website!
.09X+.08(9000-X)=780
.09X+720-.08X=780
.01X=780-720
.01X=60
X=60/.01
X=$6,000 INVESTED @ 9%
9,000-6,000=3,000 INVESTED @ 8%
PROOF:
.09*6,000+.08*3,000=780
540+240=780
780=780

RELATED QUESTIONS
Walt made an extra $9000 last year from a part-time job. he invested part of the money... (answered by checkley77,stanbon)

Problem: Walt made an extra $9000 last year from a part-time job. He invested part of... (answered by josmiceli)

Walt made an extra 9000 last year from a part time job. He invested part of the money at... (answered by ankor@dixie-net.com)

Walt made an extra $9000 last year from a part-time job. He invested part of the money at (answered by ankor@dixie-net.com)

Walt made an extra $9000 last year from a part-time job. He invested part of the money at (answered by jim_thompson5910)

Walt made an extra $9000 last year from a part-time job. He invested part of the money at (answered by greenestamps)

Walt made an extra $5000 last year from a part time job. He invested part of the money at (answered by mananth)

Walt made an extra $9000 last year from a part-time job. He invested part of the money at (answered by josmiceli)

Walt made an extra $9000 last year from a part-time job. He invested part of the money at (answered by checkley71)