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