In advanced game, Siyalatas gives 15 % bonus to DPS per level. With initial higher boost in lower level, the function for Siyalatas is: Morgulis gives 11 % bonus to DPS per level. The function is quite simple: Their combined bonus is therefore Their respective prices are n and 1: To find the best ratio, we need to use marginal utility (or marginal bonus): In economics, we maximize output when the ratio of marginal utilities (bonuses) to prices is equal for all: or Simplifying gives For example: level 100 of Siyalatas corresponds to level 500 of Siyalatas corresponds to