new percent = 3; //3 percent

new Float:earned = PropData[propertyid][p_Sell] - ((PropData[propertyid][p_Sell] / 100.0) * percent);

new float:proc = 0.97; // note that this will be equal to the amount remaining ;]
new earned = floatround(PropDate[propertyid][p_Sell]*proc); // this will round the float. there may be a slight miscalculation at some points for example *.5 at the end would lead it would be *+1 instead of *1, but tat's nothing to worry about. this should work. wtf am I writing so long anyway? :DD

forward Percent(Float:number, Float:percentage);

stock Percent(Float:number, Float:percentage) {
new Float:Sum;
Sum = (number/100)*percentage;
return floatround(Sum);
}

new wages = Percent(number,percentage);