Ok... here's an iterative formula which works in my program

Code:
for i = 0 to t
  B=B+xy(a^i)
next
basically I am trying to work out B.

I KNOW x, y and a... they're constants. It's fairly simple when you replace them with numbers.

It's the same as saying

Code:
B = xy(a^0) + xy(a^1) + xy(a^2)... and so on
What i need to do is write a similar loop or function or whatever which allows me to calculate x, assuming i know B.

It might be something like

Code:
x = b/y + b/ya ...
Do you see what I mean? I can't figure it out! this is for that bankroll calculator, by the way!

I am 27. I last did this shit when i was 21. That is a long time

If anyone knows what a for..next loop is and can do algebra/math but doesnt understand the question then please post because i might be able to explain it better