Hartja

I understand For loops and all of their components, but I was wondering if anyone has a trick to solve the end result? My wording is probably confusing so let me type out an example-(I apologize if there is a format error, I am new here) double x = 0; for (double i = 32; i < 36; i += 0.25) x += i % 32; out.println(x); I am on the computer science team at my school and I have trouble with these types of problems. I can just hand write it step by step but that takes way too long, does anyone know of a way to quickly solve it without a computer? Thank you.