Simple math question

 
I would like to buy and sell for example when price is x.xx20 or x.xx50. How can i isolate the last 2 digits of the price to compare it to my rules?
 
 
well, i can't figure out how to do it using mathmode().
Let's say you have the eur/usd price 1.3325. How do you get 25?
 
Got it!
Thanks.
Reason: