SOLUTION: You have $8000 you would like to deposit into an interest paying account. You find a simple interest account that pays 2% annually. How long must you invest that money in order to

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Question 270853: You have $8000 you would like to deposit into an interest paying account. You find a simple interest account that pays 2% annually. How long must you invest that money in order to earn $400 in interest?
Found 2 solutions by rfer, josmiceli:
Answer by rfer(16322) About Me  (Show Source):
You can put this solution on YOUR website!
i=Prt
t=i/Pr
t=400/8000*.02
t=400/160
t=2.5 yrs

Answer by josmiceli(19441) About Me  (Show Source):
You can put this solution on YOUR website!
If the 2% interest on the principle is
reinvested each year,
A+=+P%2A%281+%2B+t%2Ar%29
A+=+400+%2B+8000
P+=+8000
r+=+.02
-----------------------
8400+=+8000%2A%281+%2B+t%2A.02%29
8400%2F8000+=+1+%2B+.02t
.02t+=+1.05+-+1
.02t+=+.05
t+=+2.5
The $8000 must be invested for 2.5 years