 <translate> The relevant sentence in the passage is: The professional tax is a slab-amount based on the gross income of the professional and salaried and as well as the other states as may be decided employee's. Therefore, the final answer is gross income. <yor> Ẹya ti o yẹ ninu ẹsẹ naa ni: Owo-ori ọjọgbọn jẹ iye ti o da lori owo-ori ti o pọju ti ọjọgbọn ati ti o ni owo-ori ati bakannaa awọn ipinlẹ miiran bi o ti le pinnu oṣiṣẹ. Nítorí náà, ìdáhùn tó gbẹ̀yìn ni owó tó ń wọlé fún gbogbo èèyàn. 