Solving for 'P' in simple interest problem.

[Trent]

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

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

[stapel_eliz]

...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...?

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

. . . . .

Factor out the variable

. . . . .

Then divide through by everything non-

. . . . .

[Trent]

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.