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8 November, 12:11

Susan invests

2

times as much money at

8%

as she does at

4%

. If her total interest after

1

year is

$800

, how much does she have invested at each rate?

+3
Answers (1)
  1. 8 November, 15:20
    0
    Let f=amount invested at 4% and e=amount invested at 8%

    0.04f+.08e=800

    However, e=2f so the above equation becomes:

    0.04f+0.08 (2f) = 800

    0.04f+0.16f=800

    0.2f=800

    f=$4000, since e=2f

    e=$8000

    So Susan invested $4000 at 4% and $8000 at 8%.
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