SOLUTION: The $156.25 six month increase in your stock value reflects a return of 1.25 percentage points higher than does the $200 six month increase in your friend's stock value. Your frien

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Question 178633: The $156.25 six month increase in your stock value reflects a return of 1.25 percentage points higher than does the $200 six month increase in your friend's stock value. Your friend invested $4000. How much did you invest?
Answer by Mathtut(3670) About Me  (Show Source):
You can put this solution on YOUR website!
The friend invested 4000 at interest rate(lets call it x) and earned 200
:
4000x=200
:
x=.05 or 5% interest.
:
we know that you recieved a return of 1.25% more than your friend, that would be 5%+1.25%=6.25%. You earned 156.25 so lets call the amount you invested y
:
.0625y=156.25
:
highlight%28y=2500%29dollars-amount you invested in your stock