i saw the formula some where, not sure i can hunt it up, but the basic thing to look at, is not total profit, but profit over cost. some one that makes 400B income a gm, with 250B cost, will have a lower FI than some that makes 200B with 100B cost. even though they are making more.
really, i wouldn't worry about your FI. focus on making money, and your FI will fall into place.