It's relative simple first most games use a degressive system when it comes to stats. Secondly 26/750 = 0.03466666 a number like that wouldn't be choosen if you have a linear system, their you would either use 3% per 100 points or so. Most likely you will start somewhere around 5% per 100 points and ones you hit a certain cap it will be degressive. The reason why many games use a system like that is, that with such a system they are able to prevent extrem builds.