Solving for 'P' in simple interest problem.

Quadratic equations and inequalities, variation equations, function notation, systems of equations, etc.
Trent
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Joined: Sun May 31, 2009 1:05 am
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Solving for 'P' in simple interest problem.

Postby Trent » Sun May 31, 2009 1:15 am

Hi,
I've been stuck on this one problem the entire day. :confused:

Question: If an amount P is invested at simple annual interest rate r, then the amount A available at the end of t years is given by A=P+Prt. Solve for P, in terms of A, t and r.

The closest solution I have has been:
A=P+Prt
A/P=(P+Prt)/P
A/P=rt

but, finding how to remove or move the A from the P side of the problem has been an ongoing adventure.

In need of assistance, Please.

Have a Great day,
Trent

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stapel_eliz
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Postby stapel_eliz » Sun May 31, 2009 11:49 am

Trent wrote:...A=P+Prt. Solve for P, in terms of A, t and r.

The closest solution I have has been:
A=P+Prt
A/P=(P+Prt)/P
A/P=rt

How did you get that P/P equalled zero...? :shock:

Try being a little more explicit in your steps when solving literal equations:

. . . . .

Factor out the variable

. . . . .

Then divide through by everything non-

. . . . .

:wink:

Trent
Posts: 2
Joined: Sun May 31, 2009 1:05 am
Contact:

Re: Solving for 'P' in simple interest problem.

Postby Trent » Mon Jun 01, 2009 12:11 am

:D
Thank you Very much!

I have been out of Algebra for Many years...and apparently, it shows.

Taking an intermediate algebra for a much needed refresher course.


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