To solve A = P(1 + rt) for r, first isolate (1 +rt) by dividing both sides of this equation by P:
A/P = 1 + rt.
Next, isolate rt by subtracting 1 from both sides:
A/P - 1 = rt
Finally, divide both sides by t:
A/P - 1
----------- = r
t
This could be written in other formats, such as:
A - P
-------- = r
Pt
